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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 4 $ 41 $ 6  
Transfers out of Level 3 (3) (132) (198)  
Total gains/losses for the period:        
Included in OCI 0 0 0  
Purchases/originations 0 7 0  
Sales   0    
Repayments 0 0 0  
Settlements 0 0 0  
Opening balance (2) 4 41  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (8) $ (41) $ 34  
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: $ (3) $ 88 $ 233  
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  
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] Provision (benefit) for loan and lease losses      
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 494 351    
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 494 351    
Residential mortgage        
Level 3 Assets Roll Forward:        
Fair value election for servicing assets previously measured using the amortization method 494 351 210  
Revision of Prior Period, Adjustment | Residential mortgage        
Level 3 Assets Roll Forward:        
Fair value election for servicing assets previously measured using the amortization method       $ 205
MSRs        
Level 3 Assets Roll Forward:        
Opening balance 351 210 7  
Transfers out of Level 3 0 0 0  
Total gains/losses for the period:        
Included in OCI 0 0 0  
Purchases/originations 85 194 102  
Sales   0    
Repayments 0 0 0  
Settlements (56) (80) 0  
Closing balance 494 351 210  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 114 27 (104)  
MSRs | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 114 27 (104)  
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        
Level 3 Assets Roll Forward:        
Opening balance 3,477 2,951 2,999  
Transfers out of Level 3 0 0 0  
Total gains/losses for the period:        
Included in OCI (262) (46) 65  
Purchases/originations 1,087 1,835 623  
Sales   (369)    
Repayments 0 0 0  
Settlements (1,045) (893) (734)  
Closing balance 3,248 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 (257) (47) 68  
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: (5) (1) (2)  
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 9 2  
Transfers out of Level 3 0 0 0  
Total gains/losses for the period:        
Included in OCI 0 0 0  
Purchases/originations 4 11 7  
Repayments 0 0 0  
Settlements (1) 2 0  
Closing balance 20 20 9  
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: (3) (2) 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 70 10 48  
Transfers out of Level 3 0 0 0  
Total gains/losses for the period:        
Included in OCI (1) 0 0  
Purchases/originations 31 115 28  
Sales   0    
Repayments 0 0 0  
Settlements (26) (55) (66)  
Closing balance 74 70 10  
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (1) 0 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 | Provision for credit losses        
Total gains/losses for the period:        
Included in earnings: 0      
Automobile        
Total gains/losses for the period:        
Sales   0    
Loans held for investment        
Level 3 Assets Roll Forward:        
Opening balance 19 23 26  
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  
Repayments (4) (4) (3)  
Settlements 0 0 0  
Closing balance 16 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 0  
Loans held for investment | Mortgage banking income        
Total gains/losses for the period:        
Included in earnings: 1 0 0  
Loans held for investment | Interest and fee income        
Total gains/losses for the period:        
Included in earnings: 0 $ 0 $ 0  
Loans held for investment | Provision for credit losses        
Total gains/losses for the period:        
Included in earnings: $ 0