Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs         $ 48   $ 6 $ 8 $ (2)
Assets Level 3 Roll Forward:                  
Transfers into Level 3     $ 0            
Transfers out of Level 3 (1)     (139) $ (44)          
Total gains/losses for the period:                  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings     181 50          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)     0 0          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases     0 0          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements     0 0          
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)     42 (6)          
MSRs                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0          
Assets Level 3 Roll Forward:                  
Opening balance $ 172 $ 9 7 10          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings 19 (1) (21) (2)          
Included in OCI 0 0 0 0          
Purchases/originations 0 0 0 0          
Repayments 0 0 0 0          
Settlements 0 0 0 0          
Closing balance 172 9 7 10 191 $ 205 7 8 10
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 18 (1) (22) (2)          
Derivative instruments                  
Assets Level 3 Roll Forward:                  
Opening balance 40 9              
Transfers out of Level 3 (1) (64) (20)              
Total gains/losses for the period:                  
Included in earnings (72) (19)              
Included in OCI 0 0              
Purchases/originations 0 0              
Repayments 0 0 0 0          
Settlements 0 0              
Closing balance 40 9     48     8  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 8 (1)              
Municipal securities                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0          
Assets Level 3 Roll Forward:                  
Opening balance 3,102 3,202 2,999 3,165          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings (1) (1) (2) (1)          
Included in OCI 60 24 61 70          
Purchases/originations 154 28 491 136          
Repayments 0 0 0 0          
Settlements (226) (159) (460) (276)          
Closing balance 3,102 3,202 2,999 3,165 3,089   2,999 3,094 3,165
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0 0 0          
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 62 23 64 68          
Private-label CMO                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0            
Assets Level 3 Roll Forward:                  
Opening balance 5   2            
Transfers out of Level 3 (1) 0                
Total gains/losses for the period:                  
Included in earnings 0   0            
Included in OCI 0   0            
Purchases/originations 0   3            
Repayments 0   0            
Settlements 0   0            
Closing balance 5   2   5   2    
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0   0            
Asset-backed securities                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0            
Assets Level 3 Roll Forward:                  
Opening balance 56 0 48 0          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings 0 0 0 0          
Included in OCI 0 0 0 55          
Purchases/originations 0 55 28 0          
Repayments 0 0 0 0          
Settlements (7) 0 (27)            
Closing balance 56 0 48 0 49   48 55 0
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0 0 0          
Automobile                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0            
Real Estate Loan [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     0 0          
Assets Level 3 Roll Forward:                  
Opening balance 25 28 26 30          
Transfers out of Level 3 (1) 0 0              
Total gains/losses for the period:                  
Included in earnings 0 0 0 0          
Included in OCI 0 0 0 0          
Purchases/originations 0 0 0 0          
Repayments (1) (1) (2) (3)          
Settlements 0 0 0 0          
Closing balance 25 28 26 30 24   26 $ 27 $ 30
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ 0 $ 0 $ 0 $ 0          
Fair Value, Recurring [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         14,807   14,149    
Fair Value, Recurring [Member] | Commercial MBS                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         807   976    
Fair Value, Recurring [Member] | Residential MBS                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         5,761   4,222    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         11,659   11,090    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial MBS                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         807   976    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Residential MBS                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Available-for-sale securities         $ 5,761   $ 4,222