Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value Disclosures [Abstract]    
Gross amounts of recognized assets $ 1,829 $ 1,946
Derivative Liability, Fair Value, Gross Liability 874 1,033
Consumer loans 118 94
Loans Held-for-sale, Fair Value Disclosure 1,531 1,198
Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
MSRs 274 210
Available-for-sale securities 19,375 16,485
Loans Held-for-sale, Fair Value Disclosure 1,531 1,198
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
MSRs 274 210
Gross amounts of recognized assets 21 43
Derivative Liability, Fair Value, Gross Liability 11 2
Available-for-sale securities 3,128 2,970
Consumer loans 22 23
Loans Held-for-sale, Fair Value Disclosure 0 0
Residential MBS | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 10,645 7,935
Residential MBS | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 0 $ 0
Residential MBS | 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 0.22 0.24
Residential MBS | 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 MBS | 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 0.06 0.08
Residential MBS | 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 0.03 0.04
Residential MBS | 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 0.12 0.17
Residential MBS | 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 0.05 0.05
Asset-backed securities | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 247 $ 192
Asset-backed securities | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 47 10
Municipal securities | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 3,122 3,004
Municipal securities | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 3,070 2,951
Corporate debt | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities 857 445
Corporate debt | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Disclosures [Abstract]    
Available-for-sale securities $ 0 $ 0
Corporate debt | 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 0.02 0.01
Corporate debt | 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 | 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 | 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 0
Corporate debt | 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 | 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 | 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 0.01 0.01
Corporate debt | 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 | 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 0.25 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]    
Derivative Asset, Measurement Input 0.12 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) (0.04)
Fair Value Disclosures [Abstract]    
Loans held for investment, Measurement Input 0.01  
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 0.06 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 0.90  
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   0.03
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   0.88