Annual report pursuant to Section 13 and 15(d)

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

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FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative assets gross $ 856 $ 500
Gross amounts of recognized liabilities 521 404
Consumer loans 81 79
Loans held for sale $ 781 613
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 $ 7 10
Available-for-sale securities 14,149 13,780
Loans held for sale 781 613
Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
MSRs 7 10
Derivative assets gross 8 5
Gross amounts of recognized liabilities 2 3
Available-for-sale securities 3,049 3,165
Consumer loans 26 30
Loans held for sale 0 0
Nonrecurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Impaired loans   33
Fair Value    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities 14,149 13,780
Fair Value | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities 3,049 3,165
Fair Value | Nonrecurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
MSRs 206  
Impaired loans 26  
Fair Value | Nonrecurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
MSRs 206  
Impaired loans 26  
Asset-backed securities | Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities 579 315
Asset-backed securities | Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 48 $ 0
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 0.02 0.04
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 1.62 1.63
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 0.07
Residential MBS | Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 4,222 $ 1,255
Residential MBS | Recurring | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Available-for-sale securities $ 0 $ 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 0.26 0.54
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 0.06
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 0.08
Residential MBS | Measurement Input, Constant Prepayment Rate [Member] | Nonrecurring | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.31  
Residential MBS | Measurement Input, Constant Prepayment Rate [Member] | Nonrecurring | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.10  
Residential MBS | Measurement Input, Constant Prepayment Rate [Member] | Nonrecurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.12  
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 0.11
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 0.05
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
Residential MBS | Measurement Input, Option Adjusted Spread [Member] | Nonrecurring | 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  
Residential MBS | Measurement Input, Option Adjusted Spread [Member] | Nonrecurring | 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  
Residential MBS | Measurement Input, Option Adjusted Spread [Member] | Nonrecurring | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input 0.09  
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 0.12 0.09
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 0.09
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 0.06 0.09
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 0.05 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 0.05 0.09
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 0.11 0.23
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 (0.02) (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 1
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 0.91  
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 0.02 0.01
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   0.92
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 $ 51 $ 53
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 0.80 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 0.24 0.25
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 0.03 0.04
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 0.02 0.04
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 0.02 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 0.39
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 0
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 0.04 0.03