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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 |  |  |

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