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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Assets Level 3 Roll Forward:                
Transfers into Level 3     $ 0          
Transfers out of Level 3     (18)          
Total gains/losses for the period:                
Repayments       $ 0        
Derivative instruments                
Opening balance $ (1) $ (9) (1) (9) $ (2) $ (2) $ (5) $ 4
Transfers into Level 3 0              
Transfers out of Level 3 (8) (6)   (6)        
Included in earnings:   2            
Included in OCI 0 0 0 0        
Purchases/originations 0 0 0 0        
Repayments 0 0            
Settlements 0 0 0 0        
Closing balance (1) (9) (1) (9)        
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (3) (8) 1 (17)        
Mortgage banking income                
Derivative instruments                
Included in earnings: 9   19 (7)        
Interest and fee income                
Derivative instruments                
Included in earnings: 0   0 0        
Provision for credit losses                
Derivative instruments                
Included in earnings:       0        
MSRs                
Assets Level 3 Roll Forward:                
Opening balance 505 463 494 351        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0 0        
Total gains/losses for the period:                
Included in earnings:   17            
Included in OCI 0 0 0 0        
Purchases/originations 18 20 49 68        
Repayments 0 0   0        
Settlements (13) (14) (36) (45)        
Closing balance 547 486 547 486 505 494 463 351
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 37 17 40 112        
MSRs | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 37   40 112        
MSRs | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 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 3,496 3,377 3,248 3,477        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0 0        
Total gains/losses for the period:                
Included in earnings:   0            
Included in OCI 17 (66) 13 (274)        
Purchases/originations 160 309 715 867        
Repayments 0 0   0        
Settlements (234) (288) (537) (732)        
Closing balance 3,437 3,332 3,437 3,332 3,496 3,248 3,377 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 12 (69) 2 (274)        
Municipal securities | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 0   0 0        
Municipal securities | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: (2)   (2) (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 22 20 20        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0 0        
Total gains/losses for the period:                
Included in earnings:   0            
Included in OCI 0 0 0 0        
Purchases/originations 0 0 1 4        
Repayments 0 0   0        
Settlements 0 (1) 0 (1)        
Closing balance 20 21 20 21 20 20 22 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        
Private-label CMO | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 0   (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 75 44 74 71        
Transfers into Level 3 0   0          
Transfers out of Level 3 0 0 0 0        
Total gains/losses for the period:                
Included in earnings:   0            
Included in OCI 0 0 1 (1)        
Purchases/originations 0 26 0 26        
Repayments 0 0   0        
Settlements 0 0 0 (26)        
Closing balance 75 70 75 70 75 74 44 71
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 (1) 0 (1)        
Asset-backed securities | Mortgage banking income                
Total gains/losses for the period:                
Included in earnings: 0   0 0        
Asset-backed securities | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: 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 33 17 16 19        
Transfers into Level 3 21   40          
Transfers out of Level 3 0 0 0 0        
Total gains/losses for the period:                
Included in earnings:   0            
Included in OCI 0 0 0 0        
Purchases/originations 0 0 0 0        
Repayments 2 (1)   (3)        
Settlements 0 0 0 0        
Closing balance 53 16 53 16 $ 33 $ 16 $ 17 $ 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        
Loans held for investment | Interest and fee income                
Total gains/losses for the period:                
Included in earnings: $ (3)   $ (3) 0        
Loans held for investment | Provision for credit losses                
Total gains/losses for the period:                
Included in earnings:       $ 0