Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Disclosures [Abstract]    
Gross amounts of recognized assets $ 522 $ 500
Derivative Liability, Fair Value, Gross Liability 371 404
Consumer loans 79 79
Loans Held-for-sale, Fair Value Disclosure 523 613
Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
MSRs 10 10
Available-for-sale securities 13,982 13,780
Loans Held-for-sale, Fair Value Disclosure 523 613
Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Impaired loans Fair Value Disclosure   33
Accrued income and other assets Fair Value Disclosure   20
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
MSRs 10 10
Gross amounts of recognized assets 8 5
Derivative Liability, Fair Value, Gross Liability 3 3
Available-for-sale securities 3,237 3,165
Consumer loans 29 30
Loans Held-for-sale, Fair Value Disclosure $ 0 $ 0
Weighted Average | Market Approach Valuation Technique | Level 3 | Derivative Financial Instruments, Liabilities [Member]    
Fair Value Disclosures [Abstract]    
Fair Value Inputs, Timing of the resolution of the litigation Jun. 30, 2020  
Loans held for investment [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.12 0.09
Loans held for investment [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.08 0.09
Loans held for investment [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.08 0.09
Loans held for investment [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.07 0.07
Loans held for investment [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.09 0.09
Loans held for investment [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.08 0.09
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 1,373 $ 1,255
Residential Mortgage Backed Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Servicing Asset, Measurement Input 0.27 0.54
Residential Mortgage Backed Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Servicing Asset, Measurement Input 0.11 0.11
Residential Mortgage Backed Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Servicing Asset, Measurement Input 0.06 0.06
Residential Mortgage Backed Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Servicing Asset, Measurement Input 0.05 0.05
Residential Mortgage Backed Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Servicing Asset, Measurement Input 0.08 0.08
Residential Mortgage Backed Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Servicing Asset, Measurement Input 0.09 0.08
Derivative Financial Instruments, Liabilities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Estimated Conversion Factor [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Derivative Liability, Measurement Input 1.63 1.630
Derivative Financial Instruments, Liabilities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Estimated Growth Rate of Visa Class A Shares [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Derivative Liability, Measurement Input 0.07 0.070
Derivative Financial Instruments, Liabilities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Derivative Liability, Measurement Input 0.03 0.040
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 349 $ 315
Asset-backed Securities [Member] | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 0 0
Municipal securities | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 3,518 3,440
Municipal securities | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 3,237 3,165
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 52 53
Corporate Debt Securities [Member] | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 0 $ 0
Corporate Debt Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.03 0.04
Corporate Debt Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.39 0.39
Corporate Debt Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.90 0.90
Corporate Debt Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.03 0.04
Corporate Debt Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.00 0.00
Corporate Debt Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.05 0.05
Corporate Debt Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.03 0.04
Corporate Debt Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.03 0.03
Corporate Debt Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.24 0.25
Derivative Financial Instruments, Assets [Member] | Maximum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Net Market Price [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Asset, Measurement Input 0.11 0.23
Derivative Financial Instruments, Assets [Member] | Maximum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Asset, Measurement Input 1.00 1.00
Derivative Financial Instruments, Assets [Member] | Minimum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Net Market Price [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Asset, Measurement Input (0.03) (0.05)
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.03  
Derivative Financial Instruments, Assets [Member] | Minimum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Asset, Measurement Input 0.02 0.01
Derivative Financial Instruments, Assets [Member] | Minimum | Market Approach Valuation Technique | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.88  
Derivative Financial Instruments, Assets [Member] | Weighted Average | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Net Market Price [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Asset, Measurement Input   0.02
Derivative Financial Instruments, Assets [Member] | Weighted Average | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Asset, Measurement Input   0.92
Loans held for sale [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Loans Held-for-sale, Fair Value Disclosure   $ 121
Loans held for sale [Member] | Valuation Technique, Appraisal Value [Member] | Level 3 | Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Loans Held-for-sale, Fair Value Disclosure   $ 24
Loans held for sale [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Loans Held-for-sale, Measurement Input   0.06
Loans held for sale [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Loans Held-for-sale, Measurement Input   0.05
Loans held for sale [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Loans Held-for-sale, Measurement Input   0.05