Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value Disclosures [Abstract]    
Gross amounts of recognized assets $ 2,384 $ 856
Derivative Liability, Fair Value, Gross Liability 1,372 521
Consumer loans 81 81
Loans Held-for-sale, Fair Value Disclosure 836 781
Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
MSRs 165 7
Available-for-sale securities 14,622 14,149
Loans Held-for-sale, Fair Value Disclosure 836 781
Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
Impaired loans Fair Value Disclosure   26
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
MSRs 165 7
Gross amounts of recognized assets 42 8
Derivative Liability, Fair Value, Gross Liability 3 2
Available-for-sale securities 3,008 3,049
Consumer loans 26 26
Loans Held-for-sale, Fair Value Disclosure 0 0
Level 3 | Fair Value, Measurements, Nonrecurring    
Fair Value Disclosures [Abstract]    
MSRs   206
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 4,304 4,222
Residential Mortgage Backed Securities [Member] | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 0 $ 0
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]    
Servicing Asset, Measurement Input 0.37 0.26
Residential Mortgage Backed Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input   0.31
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]    
Servicing Asset, Measurement Input 0.11 0.11
Residential Mortgage Backed Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input   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]    
Servicing Asset, Measurement Input 0.12 0
Residential Mortgage Backed Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input   0.10
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]    
Servicing Asset, Measurement Input 0.05 0.05
Residential Mortgage Backed Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input   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]    
Servicing Asset, Measurement Input 0.18 0.08
Residential Mortgage Backed Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input   0.12
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]    
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, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Servicing Asset, Measurement Input   0.09
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 547 $ 579
Asset-backed Securities [Member] | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 69 48
Municipal securities | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 2,992 3,055
Municipal securities | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 2,937 2,999
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 47 51
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 0.03
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 0.80 0.80
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 0.02
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 0
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 0.02
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 0.04 0.04
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 0.24
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]    
Derivative Asset, Measurement Input 0.13 0.11
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]    
Derivative Asset, Measurement Input 1 1
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]    
Derivative Asset, Measurement Input (0.05) (0.02)
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.04  
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]    
Derivative Asset, Measurement Input 0.03 0.02
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 0.85  
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]    
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]    
Derivative Asset, Measurement Input   0.91