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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 | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | $ 15,296 |  |
Provision for credit losses |  | 11,716 | $ 10,426 | $ 5,847
Balance at the end of the period |  | 16,258 | 15,296 |
Translation adjustment and purchase credit deteriorated loans |  |  | 32 | 10
Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 15,296 | 13,240 | 11,430
Charge-offs |  | (13,749) | (10,702) | (6,064)
Recoveries |  | 3,001 | 2,288 | 2,091
Net charge-offs |  | (10,748) | (8,414) | (3,973)
Provision for credit losses |  | 11,730 | 10,485 | 5,800
Allowance build for credit losses |  | 982 | 2,071 | 1,827
Other changes |  | (20) | 48 | (17)
Balance at the end of the period |  | 16,258 | 15,296 | 13,240
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  |  | (63) |
Balance at the end 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 |
Balance at the end of the period |  |  |  | 13,177
Reserve for unfunded lending commitments |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 158 | 218 | 165
Provision for credit losses |  | (15) | (60) | 53
Balance at the end of the period |  | 143 | 158 | 218
Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 15,454 | 13,458 |
Balance at the end of the period |  | 16,401 | 15,454 | 13,458
Credit Card: | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 11,709 | 9,545 | 8,345
Charge-offs |  | (10,757) | (7,787) | (4,362)
Recoveries |  | 1,770 | 1,315 | 1,314
Net charge-offs |  | (8,987) | (6,472) | (3,048)
Provision for credit losses |  | 10,272 | 8,651 | 4,265
Allowance build for credit losses |  | 1,285 | 2,179 | 1,217
Other changes |  | (20) | 48 | (17)
Balance at the end of the period |  | 12,974 | 11,709 | 9,545
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) |
Balance at the end 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 |
Balance at the end 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
Provision for credit losses |  | 0 | 0 | 0
Balance at the end of the period |  | 0 | 0 | 0
Credit Card: | Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 11,709 | 9,545 |
Balance at the end of the period |  | 12,974 | 11,709 | 9,545
Consumer Banking: | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 2,042 | 2,237 | 1,918
Charge-offs |  | (2,758) | (2,327) | (1,614)
Recoveries |  | 1,165 | 963 | 760
Net charge-offs |  | (1,593) | (1,364) | (854)
Provision for credit losses |  | 1,435 | 1,169 | 1,173
Allowance build for credit losses |  | (158) | (195) | 319
Other changes |  | 0 | 0 | 0
Balance at the end of the period |  | 1,884 | 2,042 | 2,237
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 |
Balance at the end 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 |
Balance at the end 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
Provision for credit losses |  | 0 | 0 | 0
Balance at the end of the period |  | 0 | 0 | 0
Consumer Banking: | Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 2,042 | 2,237 |
Balance at the end of the period |  | 1,884 | 2,042 | 2,237
Commercial Banking: | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 1,545 | 1,458 | 1,167
Charge-offs |  | (234) | (588) | (88)
Recoveries |  | 66 | 10 | 17
Net charge-offs |  | (168) | (578) | (71)
Provision for credit losses |  | 23 | 665 | 362
Allowance build for credit losses |  | (145) | 87 | 291
Other changes |  | 0 | 0 | 0
Balance at the end of the period |  | 1,400 | 1,545 | 1,458
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 |
Balance at the end 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 |
Balance at the end of the period |  |  |  | 1,458
Commercial Banking: | Reserve for unfunded lending commitments |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 158 | 218 | 165
Provision for credit losses |  | (15) | (60) | 53
Balance at the end of the period |  | 143 | 158 | 218
Commercial Banking: | Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 1,703 | 1,676 |
Balance at the end of the period |  | $ 1,543 | $ 1,703 | $ 1,676
Domestic Credit Card Portfolio Segment |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance build for credit losses | $ 826 |  |  |

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- Definition Financing Receivable Allowance For Credit Loss Translation Adjustments And Purchase Credit Deteriorated Loans + References No definition available. + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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