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, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Derivative instruments        
Opening balance   $ 10    
Sales $ 0      
Closing balance   10    
Mortgage banking income        
Derivative instruments        
Included in earnings: (7) 8    
Interest and Fee Income        
Derivative instruments        
Included in earnings: 0      
Provision For Credit Loss        
Derivative instruments        
Included in earnings: 0      
MSRs        
Assets Level 3 Roll Forward:        
Opening balance 351 210    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 29 33    
Sales 0      
Repayments 0 0    
Settlements (15) (20)    
Closing balance 416 274 $ 351 $ 210
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 51 51    
MSRs | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 51 51    
MSRs | Interest and Fee Income        
Total gains/losses for the period:        
Included in earnings: 0      
MSRs | Provision For Credit Loss        
Total gains/losses for the period:        
Included in earnings: 0      
Derivative instruments        
Derivative instruments        
Opening balance (10)   4 41
Transfers out of Level 3 (7) (39)    
Included in OCI 0 0    
Purchases/originations 0 0    
Repayments 0 0    
Settlements 0 0    
Closing balance (10)      
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 16 26    
Municipal securities        
Assets Level 3 Roll Forward:        
Opening balance 3,477 2,951    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI (120) (4)    
Purchases/originations 172 209    
Sales 0      
Repayments 0 0    
Settlements (241) (86)    
Closing balance 3,282 3,070 3,477 2,951
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (118) (5)    
Municipal securities | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Municipal securities | Interest and Fee Income        
Total gains/losses for the period:        
Included in earnings: (2)      
Municipal securities | Provision For Credit Loss        
Total gains/losses for the period:        
Included in earnings: (4)      
Private-label CMO        
Assets Level 3 Roll Forward:        
Opening balance 20 9    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 0 2    
Sales 0      
Repayments 0 0    
Settlements 0 0    
Closing balance 19 11 20 9
Private-label CMO | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Private-label CMO | Interest and Fee Income        
Total gains/losses for the period:        
Included in earnings: (1)      
Private-label CMO | Provision For Credit Loss        
Total gains/losses for the period:        
Included in earnings: 0      
Asset-backed securities        
Assets Level 3 Roll Forward:        
Opening balance 70 10    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI (1) 0    
Purchases/originations 0 37    
Sales 0      
Repayments 0 0    
Settlements (7) 0    
Closing balance 62 47 70 10
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (1)      
Asset-backed securities | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Asset-backed securities | Interest and Fee Income        
Total gains/losses for the period:        
Included in earnings: 0      
Asset-backed securities | Provision For Credit Loss        
Total gains/losses for the period:        
Included in earnings: 0      
Loans held for investment        
Assets Level 3 Roll Forward:        
Opening balance 19 23    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 0 0    
Sales 0      
Repayments (1) (1)    
Settlements 0 0    
Closing balance 18 22 $ 19 $ 23
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0    
Loans held for investment | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 $ 0    
Loans held for investment | Interest and Fee Income        
Total gains/losses for the period:        
Included in earnings: 0      
Loans held for investment | Provision For Credit Loss        
Total gains/losses for the period:        
Included in earnings: $ 0