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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Assets Level 3 Roll Forward:                
Transfers into Level 3     $ 0          
Transfers out of Level 3     (10)          
Total gains/losses for the period:                
Repayments     0 $ 0        
Derivative instruments                
Opening balance $ (2) $ (5) (2) (5) $ 3 $ (2) $ (10) $ 4
Transfers into Level 3 0              
Transfers out of Level 3 (8) 7            
Included in OCI 0 0 0 0        
Purchases/originations 0 0 0 0        
Repayments 0 0            
Settlements 0 0 0 0        
Closing balance (2) (5) (2) (5)        
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (1) 7 4 (9)        
Mortgage banking income                
Derivative instruments                
Included in earnings: 3 (2) 10 (9)        
Interest and fee income                
Derivative instruments                
Included in earnings: 0 0 0 0        
Provision for credit losses                
Derivative instruments                
Included in earnings:       0        
MSRs                
Assets Level 3 Roll Forward:                
Opening balance 485 416 494 351        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0          
Total gains/losses for the period:                
Included in OCI 0 0 0 0        
Purchases/originations 18 18 31 48        
Repayments 0 0 0 0        
Settlements (13) (15) (23) (31)        
Closing balance 505 463 505 463 485 494 416 351
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 15 44 3 95        
MSRs | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 15 44 3 95        
MSRs | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 0        
MSRs | Provision for credit losses                
Total gains/losses for the period:                
Included in earnings:       0        
Municipal securities                
Assets Level 3 Roll Forward:                
Opening balance 3,339 3,282 3,248 3,477        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0          
Total gains/losses for the period:                
Included in OCI (7) (88) (4) (208)        
Purchases/originations 378 386 555 558        
Repayments 0 0 0 0        
Settlements (214) (203) (303) (444)        
Closing balance 3,496 3,377 3,496 3,377 3,339 3,248 3,282 3,477
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period (13) (90) (10) (205)        
Municipal securities | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 0        
Municipal securities | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 (2)        
Municipal securities | Provision for credit losses                
Total gains/losses for the period:                
Included in earnings:       (4)        
Private-label CMO                
Assets Level 3 Roll Forward:                
Opening balance 20 19 20 20        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0          
Total gains/losses for the period:                
Included in OCI 0 0 0 0        
Purchases/originations 0 4 1 4        
Repayments 0 0 0 0        
Settlements 0 0 0 0        
Closing balance 20 22 20 22 20 20 19 20
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period 0 0 0 0        
Private-label CMO | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 0        
Private-label CMO | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 0 (1) (1) (2)        
Private-label CMO | Provision for credit losses                
Total gains/losses for the period:                
Included in earnings:       0        
Asset-backed securities                
Assets Level 3 Roll Forward:                
Opening balance 74 62 74 70        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0          
Total gains/losses for the period:                
Included in OCI 1 0 1 (1)        
Purchases/originations 0 0 0 0        
Repayments 0 0 0 0        
Settlements 0 (18) 0 (25)        
Closing balance 75 44 75 44 74 74 62 70
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period 0 0 0 0        
Asset-backed securities | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 0        
Asset-backed securities | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 0        
Asset-backed securities | Provision for credit losses                
Total gains/losses for the period:                
Included in earnings:       0        
Loans held for investment                
Assets Level 3 Roll Forward:                
Opening balance 15 18 16 19        
Transfers into Level 3 19   19          
Transfers out of Level 3 0 0 0          
Total gains/losses for the period:                
Included in OCI 0 0 0 0        
Purchases/originations 0 0 0 0        
Repayments (1) (1) (2) (2)        
Settlements 0 0 0 0        
Closing balance 33 17 33 17 $ 15 $ 16 $ 18 $ 19
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        
Loans held for investment | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 0 0 0 0        
Loans held for investment | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: $ 0 $ 0 $ 0 0        
Loans held for investment | Provision for credit losses                
Total gains/losses for the period:                
Included in earnings:       $ 0