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Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments - Standby Letters of Credit and Other Financial Guarantees (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]        
Total lending-related commitments $ 1,523,109 $ 1,497,847    
Allowance for lending-related commitments 1,916 1,974 $ 2,370 $ 2,382
Total carrying value 3,866 4,139    
Standby letters of credit and other financial guarantees        
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]        
Investment-grade 19,736 19,694    
Noninvestment-grade 8,581 9,178    
Total lending-related commitments 28,317 28,872    
Allowance for lending-related commitments 87 110    
Guarantee liability 326 369    
Total carrying value 413 479    
Commitments with collateral 16,213 16,861    
Other letters of credit        
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]        
Investment-grade 3,122 3,552    
Noninvestment-grade 946 836    
Total lending-related commitments 4,068 4,388    
Allowance for lending-related commitments 37 37    
Guarantee liability 0 0    
Total carrying value 37 37    
Commitments with collateral $ 475 $ 539