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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 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period       $ 15,296  
Provision for credit losses $ 2,482   $ 2,284 9,074 $ 7,569
Balance at the end of the period 16,534     16,534  
Translation adjustment and purchase credit deteriorated loans       0 32
Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 16,649   14,646 15,296 13,240
Charge-offs (3,427)   (2,581) (10,061) (7,596)
Recoveries 823   582 2,197 1,715
Net charge-offs (2,604)   (1,999) (7,864) (5,881)
Provision for credit losses 2,470   2,321 9,091 7,626
Allowance build (release) for credit losses (134)   322 1,227 1,745
Other changes 19   (13) 11 33
Balance at the end of the period 16,534 $ 16,649 14,955 16,534 14,955
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         (63)
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         13,177
Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 129   197 158 218
Provision for credit losses 13   (39) (16) (60)
Balance at the end of the period 142 129 158 142 158
Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 16,676   15,113 16,676 15,113
Credit Card: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 13,040   10,976 11,709 9,545
Charge-offs (2,632)   (1,925) (7,892) (5,481)
Recoveries 478   333 1,273 992
Net charge-offs (2,154)   (1,592) (6,619) (4,489)
Provision for credit losses 2,084   1,953 7,888 6,298
Allowance build (release) for credit losses (70)   361 1,269 1,809
Other changes 19   (13) 11 33
Balance at the end of the period 12,989 13,040 11,324 12,989 11,324
Credit Card: | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         (63)
Credit Card: | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         9,482
Credit Card: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 0   0 0 0
Provision for credit losses 0   0 0 0
Balance at the end of the period 0 0 0 0 0
Credit Card: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 12,989   11,324 12,989 11,324
Consumer Banking: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 2,065   2,185 2,042 2,237
Charge-offs (707)   (596) (2,003) (1,653)
Recoveries 306   247 869 718
Net charge-offs (401)   (349) (1,134) (935)
Provision for credit losses 351   213 1,107 747
Allowance build (release) for credit losses (50)   (136) (27) (188)
Other changes 0   0 0 0
Balance at the end of the period 2,015 2,065 2,049 2,015 2,049
Consumer Banking: | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         0
Consumer Banking: | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         2,237
Consumer Banking: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 0   0 0 0
Provision for credit losses 0   0 0 0
Balance at the end of the period 0 0 0 0 0
Consumer Banking: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 2,015   2,049 2,015 2,049
Commercial Banking: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 1,544   1,485 1,545 1,458
Charge-offs (88)   (60) (166) (462)
Recoveries 39   2 55 5
Net charge-offs (49)   (58) (111) (457)
Provision for credit losses 35   155 96 581
Allowance build (release) for credit losses (14)   97 (15) 124
Other changes 0   0 0 0
Balance at the end of the period 1,530 1,544 1,582 1,530 1,582
Commercial Banking: | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         0
Commercial Banking: | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period         1,458
Commercial Banking: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 129   197 158 218
Provision for credit losses 13   (39) (16) (60)
Balance at the end of the period 142 129 158 142 158
Commercial Banking: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period $ 1,672   $ 1,740 $ 1,672 $ 1,740
Domestic Credit Card Portfolio Segment          
Allowance for Credit Losses [Roll Forward]          
Allowance build (release) for credit losses   $ 826