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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Allowance for Credit Losses and Reserve for Unfunded Lending Commitments Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period $ 16,258  
Provision for credit losses 2,369 $ 2,683
Allowance build for credit losses (359)  
Balance at the end of the period 15,899  
Allowance for credit losses    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 16,258 15,296
Charge-offs (3,692) (3,273)
Recoveries 956 657
Net charge-offs (2,736) (2,616)
Provision for credit losses 2,368 2,707
Allowance build for credit losses (368) 91
Other changes 9 (7)
Balance at the end of the period 15,899 15,380
Reserve for unfunded lending commitments    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 143 158
Provision for credit losses 1 (24)
Balance at the end of the period 144 134
Combined allowance and reserve    
Allowance for Credit Losses [Roll Forward]    
Balance at the end of the period 16,043 15,514
Credit Card: | Allowance for credit losses    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 12,974 11,709
Charge-offs (2,978) (2,574)
Recoveries 579 367
Net charge-offs (2,399) (2,207)
Provision for credit losses 1,926 2,259
Allowance build for credit losses (473) 52
Other changes 9 (7)
Balance at the end of the period 12,510 11,754
Credit Card: | Reserve for unfunded lending commitments    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 0 0
Provision for credit losses 0 0
Balance at the end of the period 0 0
Credit Card: | Combined allowance and reserve    
Allowance for Credit Losses [Roll Forward]    
Balance at the end of the period 12,510 11,754
Consumer Banking: | Allowance for credit losses    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 1,884 2,042
Charge-offs (676) (660)
Recoveries 363 280
Net charge-offs (313) (380)
Provision for credit losses 301 426
Allowance build for credit losses (12) 46
Other changes 0 0
Balance at the end of the period 1,872 2,088
Consumer Banking: | Reserve for unfunded lending commitments    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 0 0
Provision for credit losses 0 0
Balance at the end of the period 0 0
Consumer Banking: | Combined allowance and reserve    
Allowance for Credit Losses [Roll Forward]    
Balance at the end of the period 1,872 2,088
Commercial Banking: | Allowance for credit losses    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 1,400 1,545
Charge-offs (38) (39)
Recoveries 14 10
Net charge-offs (24) (29)
Provision for credit losses 141 22
Allowance build for credit losses 117 (7)
Other changes 0 0
Balance at the end of the period 1,517 1,538
Commercial Banking: | Reserve for unfunded lending commitments    
Allowance for Credit Losses [Roll Forward]    
Balance at beginning of the period 143 158
Provision for credit losses 1 (24)
Balance at the end of the period 144 134
Commercial Banking: | Combined allowance and reserve    
Allowance for Credit Losses [Roll Forward]    
Balance at the end of the period $ 1,661 $ 1,672