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
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
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        
Assets Level 3 Roll Forward:            
Opening balance $ 210 7        
Transfers out of Level 3 (1) 0          
Total gains/losses for the period:            
Included in earnings 51 (47)        
Included in OCI 0 0        
Purchases/originations 33 0        
Repayments 0          
Settlements (20) 0        
Closing balance 210 7 $ 274 $ 210 $ 165 $ 7
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 51 (47)        
Derivative instruments            
Assets Level 3 Roll Forward:            
Opening balance 41 6        
Transfers out of Level 3 (1) (39) (20)        
Total gains/losses for the period:            
Included in earnings (8) (53)        
Included in OCI 0 0        
Purchases/originations 0 0        
Repayments 0          
Settlements 0 0        
Closing balance 41 6 10 41 39 6
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (26) 34        
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 out of Level 3   0        
Assets Level 3 Roll Forward:            
Opening balance 2,951 2,999        
Transfers out of Level 3 (1) 0          
Total gains/losses for the period:            
Included in earnings 0 (1)        
Included in OCI (4) (68)        
Purchases/originations 209 73        
Repayments 0          
Settlements (86) (66)        
Closing balance 2,951 2,999 3,070 2,951 2,937 2,999
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (5) (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 out of Level 3   0        
Assets Level 3 Roll Forward:            
Opening balance 9 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 2 0        
Repayments 0          
Settlements 0 0        
Closing balance 9 2 11 9 2 2
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 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 out of Level 3   0        
Assets Level 3 Roll Forward:            
Opening balance 10 48        
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 37 27        
Repayments 0          
Settlements 0 (6)        
Closing balance 10 48 47 10 69 48
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 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        
Assets Level 3 Roll Forward:            
Opening balance 23 26        
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 0        
Repayments (1)          
Settlements 0 0        
Closing balance 23 26 22 23 26 26
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ 0 $ 0        
Commercial Loan [Member]            
Total gains/losses for the period:            
MSRs     274 210 $ 165 7
Commercial Loan [Member] | Revision of Prior Period, Adjustment            
Total gains/losses for the period:            
MSRs           $ 205
Fair Value, Recurring [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities     19,375 16,485    
Total gains/losses for the period:            
MSRs     274 210    
Fair Value, Recurring [Member] | Commercial MBS            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities     1,227 1,163    
Fair Value, Recurring [Member] | Residential MBS            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Available-for-sale securities     10,645 7,935    
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     16,242 13,510    
Total gains/losses for the period:            
MSRs     0 0    
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     1,227 1,163    
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     $ 10,645 $ 7,935