Quarterly report [Sections 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, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Derivative instruments        
Opening balance $ 3 $ 4 $ 2 $ (2)
Transfers into Level 3 0 0    
Transfers out of Level 3 (7) (5)    
Included in OCI 0 0    
Purchases/originations 0 0    
Repayments 0      
Settlements 3 6    
Closing balance 3 4    
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 3 1    
Mortgage banking income        
Derivative instruments        
Included in earnings: 10 7    
Other noninterest income        
Derivative instruments        
Included in earnings: (5) (2)    
MSRs        
Level 3 Assets Roll Forward:        
Opening balance 573 515    
Transfers into Level 3 0 0    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 20 10    
Repayments 0      
Settlements (14) (11)    
Closing balance 564 534 573 515
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (15) 20    
MSRs | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: (15) 20    
MSRs | Other noninterest income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Municipal securities        
Level 3 Assets Roll Forward:        
Opening balance 3,954 3,335    
Transfers into Level 3 0 0    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 5 19    
Purchases/originations 218 72    
Repayments 0      
Settlements (248) (133)    
Closing balance 3,929 3,293 3,954 3,335
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 4 18    
Municipal securities | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Municipal securities | Other noninterest income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Private-label CMO        
Level 3 Assets Roll Forward:        
Opening balance 21 20    
Transfers into Level 3 0 0    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 0 0    
Repayments 0      
Settlements 1 0    
Closing balance 22 20 21 20
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0    
Private-label CMO | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Private-label CMO | Other noninterest income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Asset-backed securities        
Level 3 Assets Roll Forward:        
Opening balance 49 75    
Transfers into Level 3 0 0    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 0 0    
Repayments 0      
Settlements (2) (3)    
Closing balance 47 72 49 75
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0    
Asset-backed securities | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Asset-backed securities | Other noninterest income        
Total gains/losses for the period:        
Included in earnings: 0 0    
Loans held for investment        
Level 3 Assets Roll Forward:        
Opening balance 61 54    
Transfers into Level 3 3 4    
Transfers out of Level 3 0 0    
Total gains/losses for the period:        
Included in OCI 0 0    
Purchases/originations 0 0    
Repayments (1)      
Settlements 0 0    
Closing balance 63 58 $ 61 $ 54
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 | Other noninterest income        
Total gains/losses for the period:        
Included in earnings: $ 0 $ 0