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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Available-for-sale securities $ 25,654   $ 25,654   $ 16,485    
Assets Level 3 Roll Forward:              
Transfers out of Level 3 (1)     (109) $ (139)      
Total gains/losses for the period:              
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     7 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)     33 42      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 12 $ 48 12 48 41   $ (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 0      
Assets Level 3 Roll Forward:              
Opening balance 327 172 210 7      
Transfers out of Level 3 (1) 0            
Total gains/losses for the period:              
Included in earnings 1 19 27 (21)      
Included in OCI 0 0 0 0      
Purchases/originations 31 0 162 0      
Repayments 0 0 0 0      
Settlements (21) 0 (61) 0      
Closing balance 338 191 338 191 210 $ (205) 7
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 1 18 27 (22)      
Derivative instruments              
Assets Level 3 Roll Forward:              
Opening balance 23 40          
Transfers out of Level 3 (1) (39) (64)          
Total gains/losses for the period:              
Included in earnings (28) (72)          
Included in OCI 0 0          
Purchases/originations 0 0          
Repayments 0 0 0 0      
Settlements 0 0          
Closing balance 12 48 12 48      
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (12) 8          
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 0 0      
Assets Level 3 Roll Forward:              
Opening balance 3,609 3,102 2,951 2,999      
Transfers out of Level 3 (1) 0            
Total gains/losses for the period:              
Included in earnings (1) (1) (1) (2)      
Included in OCI (8) 60 (13) 61      
Purchases/originations 260 154 1,613 491      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (17)   (369)        
Repayments 0 0 0 0      
Settlements (261) (226) (599) (460)      
Closing balance 3,582 3,089 3,582 3,089 2,951   2,999
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (10) 62 (14) 64      
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 0 0      
Assets Level 3 Roll Forward:              
Opening balance 18 5 9 2      
Transfers out of Level 3 (1) 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 8 3      
Repayments 0 0 0 0      
Settlements 0 0 1 0      
Closing balance 18 5 18 5 9   2
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   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 out of Level 3   0 0        
Assets Level 3 Roll Forward:              
Opening balance 46 56 10 48      
Transfers out of Level 3 (1) 0            
Total gains/losses for the period:              
Included in earnings 0 0 0 0      
Included in OCI 0 0 0 28      
Purchases/originations 0 0 75 0      
Repayments 0 0 0 (27)      
Settlements (11) (7) (50)        
Closing balance 35 49 35 49 10   48
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0 0 0      
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 0      
Assets Level 3 Roll Forward:              
Opening balance 21 25 23 26      
Transfers out of Level 3 (1) 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) (3) (2)      
Settlements 0 0 0 0      
Closing balance 20 24 20 24 23   $ 26
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      
Commercial MBS              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Available-for-sale securities 1,498   1,498   1,163    
Residential MBS              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Available-for-sale securities 14,337   14,337   7,935    
Fair Value, Recurring [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Available-for-sale securities 25,654   25,654   16,485    
Total gains/losses for the period:              
MSRs 338   338   210    
Fair Value, Recurring [Member] | Commercial MBS              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Available-for-sale securities 1,498   1,498   1,163    
Fair Value, Recurring [Member] | Residential MBS              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Available-for-sale securities 14,337   14,337   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 22,014   22,014   13,510    
Total gains/losses for the period:              
MSRs 0   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 1,498   1,498   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 $ 14,337   $ 14,337   $ 7,935