Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)

v3.10.0.1
FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative assets gross $ 500 $ 322
Gross amounts of recognized liabilities 404 331
Consumer loans 79 93
Loans held for sale $ 613 413
Derivative Liabilities | Weighted Average | Consensus Pricing | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair Value Inputs, Timing of the resolution of the litigation Jun. 30, 2020  
Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
MSRs $ 10 11
Available-for-sale securities 13,780 14,869
Loans held for sale 613 413
Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
MSRs 10 11
Derivative assets gross 5 6
Gross amounts of recognized liabilities 3 5
Available-for-sale securities 3,165 3,191
Consumer loans 30 38
Loans held for sale 0 0
Fair Value    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities 13,780 14,869
Fair Value | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities 3,165 3,191
Fair Value | Nonrecurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Impaired loans 33  
Other real estate owned 20  
Loans held for sale 145  
Fair Value | Nonrecurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Impaired loans 33  
Other real estate owned 20  
Loans held for sale 145  
Asset-backed securities | Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities 315 467
Asset-backed securities | Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 0 $ 24
Asset-backed securities | Measurement Input, Loss Severity [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   1.00
Asset-backed securities | Measurement Input, Loss Severity [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.90
Asset-backed securities | Measurement Input, Loss Severity [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.98
Asset-backed securities | Measurement Input, Cure Given Deferral [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.50
Asset-backed securities | Measurement Input, Cure Given Deferral [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.50
Asset-backed securities | Measurement Input, Cure Given Deferral [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.50
Asset-backed securities | Measurement Input, Discount Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.07
Asset-backed securities | Measurement Input, Discount Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.07
Asset-backed securities | Measurement Input, Discount Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.07
Asset-backed securities | Measurement Input, Prepayment Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.72
Asset-backed securities | Measurement Input, Prepayment Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.00
Asset-backed securities | Measurement Input, Prepayment Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.07
Asset-backed securities | Measurement Input, Default Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.53
Asset-backed securities | Measurement Input, Default Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.03
Asset-backed securities | Measurement Input, Default Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input   0.07
Derivative Liabilities | Measurement Input, Discount Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Liability, Measurement Input 0.04 0.030
Derivative Liabilities | Measurement Input, Estimated Conversion Factor [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Liability, Measurement Input 1.63 1.650
Derivative Liabilities | Measurement Input, Estimated Growth Rate of Visa Class A Shares [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Liability, Measurement Input 0.07 0.070
Residential MBS | Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 1,255 $ 1,367
Residential MBS | Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 0  
Residential MBS | Measurement Input, Constant Prepayment Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.54 0.33
Residential MBS | Measurement Input, Constant Prepayment Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.06 0.08
Residential MBS | Measurement Input, Constant Prepayment Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.08 0.12
Residential MBS | Measurement Input, Option Adjusted Spread [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.11 0.10
Residential MBS | Measurement Input, Option Adjusted Spread [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.05 0.08
Residential MBS | Measurement Input, Option Adjusted Spread [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.08 0.08
Loans held for investment [Member] | Measurement Input, Constant Prepayment Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.09 0.22
Loans held for investment [Member] | Measurement Input, Constant Prepayment Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.09 0.02
Loans held for investment [Member] | Measurement Input, Constant Prepayment Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.09 0.09
Loans held for investment [Member] | Measurement Input, Discount Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.09 0.18
Loans held for investment [Member] | Measurement Input, Discount Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.07 0.07
Loans held for investment [Member] | Measurement Input, Discount Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.09 0.08
Derivative Assets | Measurement Input, Net Market Price [Member] | Recurring | Maximum | Valuation Technique, Consensus Pricing Model [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset, Measurement Input 0.23 0.20
Derivative Assets | Measurement Input, Net Market Price [Member] | Recurring | Minimum | Valuation Technique, Consensus Pricing Model [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset, Measurement Input (0.05) (0.05)
Loans held for investment, Measurement Input 0.02  
Derivative Assets | Measurement Input, Net Market Price [Member] | Recurring | Weighted Average | Valuation Technique, Consensus Pricing Model [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset, Measurement Input   0.02
Derivative Assets | Measurement Input, Estimated Pull Thru [Member] | Recurring | Maximum | Valuation Technique, Consensus Pricing Model [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset, Measurement Input 1.00 1.00
Derivative Assets | Measurement Input, Estimated Pull Thru [Member] | Recurring | Minimum | Consensus Pricing | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for investment, Measurement Input 0.92  
Derivative Assets | Measurement Input, Estimated Pull Thru [Member] | Recurring | Minimum | Valuation Technique, Consensus Pricing Model [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset, Measurement Input 0.01 0.03
Derivative Assets | Measurement Input, Estimated Pull Thru [Member] | Recurring | Weighted Average | Valuation Technique, Consensus Pricing Model [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset, Measurement Input   0.75
Loans held for sale [Member] | Nonrecurring | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale $ 121  
Loans held for sale [Member] | Nonrecurring | Valuation Technique, Appraisal Value [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale $ 24  
Loans held for sale [Member] | Measurement Input, Discount Rate [Member] | Nonrecurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans Held-for-sale, Measurement Input 0.06  
Loans held for sale [Member] | Measurement Input, Discount Rate [Member] | Nonrecurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans Held-for-sale, Measurement Input 0.05  
Loans held for sale [Member] | Measurement Input, Discount Rate [Member] | Nonrecurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans Held-for-sale, Measurement Input 0.05  
Corporate obligations | Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 53 $ 109
Corporate obligations | Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 0 $ 0
Corporate obligations | Measurement Input, Loss Severity [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.90 0.90
Corporate obligations | Measurement Input, Loss Severity [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.05 0.05
Corporate obligations | Measurement Input, Loss Severity [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.25 0.24
Corporate obligations | Measurement Input, Discount Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.04 0.10
Corporate obligations | Measurement Input, Discount Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.04 0.00
Corporate obligations | Measurement Input, Discount Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.04 0.04
Corporate obligations | Measurement Input, Default Rate [Member] | Recurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.39 0.64
Corporate obligations | Measurement Input, Default Rate [Member] | Recurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.00 0.00
Corporate obligations | Measurement Input, Default Rate [Member] | Recurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.03 0.03