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Contingent Liabilities and Guarantees - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Commitments Contingencies And Guarantees [Line Items]            
Reserve for potential losses $ 291 $ 276 $ 225 $ 173 $ 166 $ 160
Standby letters of credit            
Commitments Contingencies And Guarantees [Line Items]            
Remaining weighted-average life of standby letters of credit (in years) 1 year 6 months          
Recourse agreement with FNMA            
Commitments Contingencies And Guarantees [Line Items]            
Weighted-average remaining term for outstanding commercial mortgage loans (in years) 7 years 1 month 6 days          
Unpaid principal balance outstanding of loans sold $ 22,600          
Maximum potential amount of undiscounted future payments possibly required as percentage of principal balance of loans outstanding (as a percent) 30.80%          
Reserve for potential losses $ 89          
Residential mortgage reserve            
Commitments Contingencies And Guarantees [Line Items]            
Unpaid principal balance outstanding of loans sold $ 11,000          
Maximum potential amount of undiscounted future payments possibly required as percentage of principal balance of loans outstanding (as a percent) 30.00%          
Liability for estimated repurchase obligations on loans sold $ 12          
Written Put Options, Guarantees            
Commitments Contingencies And Guarantees [Line Items]            
Weighted average life of written put options (in years) 1 year 7 months 6 days          
Minimum | Standby letters of credit            
Commitments Contingencies And Guarantees [Line Items]            
Remaining actual life of standby letters of credit (in years) 1 year          
Minimum | Low            
Commitments Contingencies And Guarantees [Line Items]            
Guarantee obligations (as a percent) 0.00%          
Minimum | Moderate            
Commitments Contingencies And Guarantees [Line Items]            
Guarantee obligations (as a percent) 30.00%          
Minimum | High            
Commitments Contingencies And Guarantees [Line Items]            
Guarantee obligations (as a percent) 70.00%          
Maximum | Standby letters of credit            
Commitments Contingencies And Guarantees [Line Items]            
Remaining actual life of standby letters of credit (in years) 11 years 4 months 24 days          
Maximum | Low            
Commitments Contingencies And Guarantees [Line Items]            
Guarantee obligations (as a percent) 30.00%          
Maximum | Moderate            
Commitments Contingencies And Guarantees [Line Items]            
Guarantee obligations (as a percent) 70.00%