Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Total gains/losses for the period:      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Debt and Equity Securities, Gain (Loss) Debt and Equity Securities, Gain (Loss) Debt and Equity Securities, Gain (Loss)
Derivative instruments      
Opening balance $ (2) $ 4 $ 41
Transfers out of Level 3 (23) (3) (132)
Total gains/losses for the period:      
Included in OCI 0 0 0
Purchases/originations 0 0 7
Sales 0   0
Repayments   0 0
Settlements 0 0 0
Opening balance (2) (2) 4
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (3) $ (8) $ (41)
Mortgage banking income      
Total gains/losses for the period:      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Mortgage banking income Mortgage banking income Mortgage banking income
Total gains/losses for the period:      
Included in earnings: $ 25 $ (3) $ 88
Interest and fee income      
Total gains/losses for the period:      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and Dividend Income, Operating Interest and Dividend Income, Operating Interest and Dividend Income, Operating
Total gains/losses for the period:      
Included in earnings: $ 0 $ 0 $ 0
Noninterest income      
Total gains/losses for the period:      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and Dividend Income, Operating    
Total gains/losses for the period:      
Included in earnings: $ (2)    
Provision for credit losses      
Total gains/losses for the period:      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Interest and Dividend Income, Operating  
Total gains/losses for the period:      
Included in earnings:   $ 0  
Fair Value, Recurring      
Level 3 Assets Roll Forward:      
Fair value election for servicing assets previously measured using the amortization method 515 494  
Level 1 | Fair Value, Recurring      
Level 3 Assets Roll Forward:      
Fair value election for servicing assets previously measured using the amortization method 0 0  
Level 2 | Fair Value, Recurring      
Level 3 Assets Roll Forward:      
Fair value election for servicing assets previously measured using the amortization method 0 0  
Level 3 | Fair Value, Recurring      
Level 3 Assets Roll Forward:      
Fair value election for servicing assets previously measured using the amortization method 515 494  
Residential mortgage      
Level 3 Assets Roll Forward:      
Fair value election for servicing assets previously measured using the amortization method 515 494 351
MSRs      
Level 3 Assets Roll Forward:      
Opening balance 494 351 210
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in OCI 0 0 0
Purchases/originations 63 85 194
Sales (1)   0
Repayments   0 0
Settlements (48) (56) (80)
Closing balance 515 494 351
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 7 114 27
MSRs | Mortgage banking income      
Total gains/losses for the period:      
Included in earnings: 7 114 27
MSRs | Interest and fee income      
Total gains/losses for the period:      
Included in earnings: 0 0 0
MSRs | Noninterest income      
Total gains/losses for the period:      
Included in earnings: 0    
MSRs | Provision for credit losses      
Total gains/losses for the period:      
Included in earnings:   0  
Municipal securities      
Level 3 Assets Roll Forward:      
Opening balance 3,248 3,477 2,951
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in OCI 73 (262) (46)
Purchases/originations 928 1,087 1,835
Sales 0   (369)
Repayments   0 0
Settlements (912) (1,045) (893)
Closing balance 3,335 3,248 3,477
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 47 (257) (47)
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) (5) (1)
Municipal securities | Noninterest income      
Total gains/losses for the period:      
Included in earnings: 0    
Municipal securities | Provision for credit losses      
Total gains/losses for the period:      
Included in earnings:   (4)  
Private-label CMO      
Level 3 Assets Roll Forward:      
Opening balance 20 20 9
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in OCI 0 0 0
Purchases/originations 1 4 11
Sales 0   0
Repayments   0 0
Settlements 0 (1) 2
Closing balance 20 20 20
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 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: (1) (3) (2)
Private-label CMO | Noninterest income      
Total gains/losses for the period:      
Included in earnings: 0    
Private-label CMO | Provision for credit losses      
Total gains/losses for the period:      
Included in earnings:   0  
Asset-backed securities      
Level 3 Assets Roll Forward:      
Opening balance 74 70 10
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in OCI 1 (1) 0
Purchases/originations 0 31 115
Sales 0   0
Repayments   0 0
Settlements 0 (26) (55)
Closing balance 75 74 70
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 1 (1) 0
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 | Noninterest income      
Total gains/losses for the period:      
Included in earnings: 0    
Asset-backed securities | Provision for credit losses      
Total gains/losses for the period:      
Included in earnings:   0  
Loans held for investment      
Level 3 Assets Roll Forward:      
Opening balance 16 19 23
Transfers into Level 3 41    
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in OCI 0 0 0
Purchases/originations 0 0 0
Sales 0   0
Repayments   (4) (4)
Settlements 0 0 0
Closing balance 54 16 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
Loans held for investment | Mortgage banking income      
Total gains/losses for the period:      
Included in earnings: 0 1 0
Loans held for investment | Interest and fee income      
Total gains/losses for the period:      
Included in earnings: (3) 0 $ 0
Loans held for investment | Noninterest income      
Total gains/losses for the period:      
Included in earnings: $ 0    
Loans held for investment | Provision for credit losses      
Total gains/losses for the period:      
Included in earnings:   $ 0