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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 | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | $ 13,240 |  |
Provision (benefit) for credit losses | 10,426 | $ 5,847 | $ (1,944)
Balance at the end of the period | 15,296 | 13,240 |
Translation adjustment and purchase credit deteriorated loans | 32 | 10 | 6
Allowance for credit losses |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | 13,240 | 11,430 | 15,564
Charge-offs | (10,702) | (6,064) | (4,740)
Recoveries | 2,288 | 2,091 | 2,506
Net charge-offs | (8,414) | (3,973) | (2,234)
Provision (benefit) for credit losses | 10,485 | 5,800 | (1,912)
Allowance build (release) for credit losses | 2,071 | 1,827 | (4,146)
Other changes | 48 | (17) | 12
Balance at the end of the period | 15,296 | 13,240 | 11,430
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 | 218 | 165 | 195
Provision (benefit) for credit losses | (60) | 53 | (30)
Balance at the end of the period | 158 | 218 | 165
Combined allowance and reserve |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | 13,458 | 11,595 |
Balance at the end of the period | 15,454 | 13,458 | 11,595
Credit Card: | Allowance for credit losses |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | 9,545 | 8,345 | 11,191
Charge-offs | (7,787) | (4,362) | (3,481)
Recoveries | 1,315 | 1,314 | 1,525
Net charge-offs | (6,472) | (3,048) | (1,956)
Provision (benefit) for credit losses | 8,651 | 4,265 | (902)
Allowance build (release) for credit losses | 2,179 | 1,217 | (2,858)
Other changes | 48 | (17) | 12
Balance at the end of the period | 11,709 | 9,545 | 8,345
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 (benefit) 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 | 9,545 | 8,345 |
Balance at the end of the period | 11,709 | 9,545 | 8,345
Consumer Banking: | Allowance for credit losses |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | 2,237 | 1,918 | 2,715
Charge-offs | (2,327) | (1,614) | (1,211)
Recoveries | 963 | 760 | 935
Net charge-offs | (1,364) | (854) | (276)
Provision (benefit) for credit losses | 1,169 | 1,173 | (521)
Allowance build (release) for credit losses | (195) | 319 | (797)
Other changes | 0 | 0 | 0
Balance at the end of the period | 2,042 | 2,237 | 1,918
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 (benefit) 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 | 2,237 | 1,918 |
Balance at the end of the period | 2,042 | 2,237 | 1,918
Commercial Banking: | Allowance for credit losses |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | 1,458 | 1,167 | 1,658
Charge-offs | (588) | (88) | (48)
Recoveries | 10 | 17 | 46
Net charge-offs | (578) | (71) | (2)
Provision (benefit) for credit losses | 665 | 362 | (489)
Allowance build (release) for credit losses | 87 | 291 | (491)
Other changes | 0 | 0 | 0
Balance at the end of the period | 1,545 | 1,458 | 1,167
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 | 218 | 165 | 195
Provision (benefit) for credit losses | (60) | 53 | (30)
Balance at the end of the period | 158 | 218 | 165
Commercial Banking: | Combined allowance and reserve |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance at beginning of the period | 1,676 | 1,332 |
Balance at the end of the period | $ 1,703 | $ 1,676 | $ 1,332

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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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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) -Publisher SEC + Details
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