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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
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | $ 15,564 |  |
Provision (benefit) for credit losses |  | (1,944) | $ 10,264 | $ 6,236
Balance at the end of the period |  | 11,430 | 15,564 |
Financing Receivable Allowance for credit loss Translation Adjustments and Purchase Credit Deteriorated Loans |  | 6 |  |
Other |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Provision (benefit) for credit losses |  | (2) | 3 | 0
Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 15,564 | 7,208 | 7,220
Charge-offs |  | (4,740) | (7,677) | (8,809)
Recoveries |  | 2,506 | 2,452 | 2,557
Net charge-offs |  | (2,234) | (5,225) | (6,252)
Provision (benefit) for credit losses |  | (1,912) | 10,238 | 6,223
Allowance build (release) for credit losses |  | (4,146) | 5,013 | (29)
Other changes |  | 12 | 36 | 17
Balance at the end of the period |  | 11,400 | 15,564 | 7,208
Allowance for credit losses | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 10,515 |
Balance at the end of the period |  |  |  | 10,515
Allowance for credit loss |  |  |  | 2,845
Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 462
Reserve for unfunded lending commitments |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 195 | 135 | 122
Provision (benefit) for credit losses |  | (30) | 23 | 13
Balance at the end of the period |  | 165 | 195 | 135
Reserve for unfunded lending commitments | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 37
Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 172 |
Balance at the end of the period |  |  |  | 172
Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 15,759 | 7,343 |
Balance at the end of the period |  | 11,595 | 15,759 | 7,343
Credit Card | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 11,191 | 5,395 | 5,535
Charge-offs |  | (3,481) | (5,749) | (6,711)
Recoveries |  | 1,525 | 1,479 | 1,562
Net charge-offs |  | (1,956) | (4,270) | (5,149)
Provision (benefit) for credit losses |  | (902) | 7,327 | 4,992
Allowance build (release) for credit losses | $ 327 | (2,858) | 3,057 | (157)
Other changes |  | 12 | 36 | 17
Balance at the end of the period |  |  | 11,191 | 5,395
Credit Card | Allowance for credit losses | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 8,098 |
Balance at the end of the period |  |  |  | 8,098
Allowance for credit loss |  |  |  | 2,241
Credit Card | Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 462
Credit Card | Reserve for unfunded lending commitments |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 0 | 0 | 0
Provision (benefit) for credit losses |  | 0 | 0 | 0
Balance at the end of the period |  | 0 | 0 | 0
Credit Card | Reserve for unfunded lending commitments | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 0
Credit Card | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 0 |
Balance at the end of the period |  |  |  | 0
Credit Card | Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 11,191 | 5,395 |
Balance at the end of the period |  | 8,345 | 11,191 | 5,395
Consumer Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 2,715 | 1,038 | 1,048
Charge-offs |  | (1,211) | (1,534) | (1,917)
Recoveries |  | 935 | 956 | 970
Net charge-offs |  | (276) | (578) | (947)
Provision (benefit) for credit losses |  | (521) | 1,753 | 937
Allowance build (release) for credit losses |  | (797) | 1,175 | (10)
Other changes |  | 0 | 0 | 0
Balance at the end of the period |  |  | 2,715 | 1,038
Consumer Banking | Allowance for credit losses | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 1,540 |
Balance at the end of the period |  |  |  | 1,540
Allowance for credit loss |  |  |  | 502
Consumer Banking | Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 0
Consumer Banking | Reserve for unfunded lending commitments |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 0 | 5 | 4
Provision (benefit) for credit losses |  | 0 | 0 | 1
Balance at the end of the period |  | 0 | 0 | 5
Consumer Banking | Reserve for unfunded lending commitments | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | (5)
Consumer Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 0 |
Balance at the end of the period |  |  |  | 0
Consumer Banking | Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 2,715 | 1,043 |
Balance at the end of the period |  | 1,918 | 2,715 | 1,043
Commercial Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 1,658 | 775 | 637
Charge-offs |  | (48) | (394) | (181)
Recoveries |  | 46 | 17 | 25
Net charge-offs |  | (2) | (377) | (156)
Provision (benefit) for credit losses |  | (489) | 1,158 | 294
Allowance build (release) for credit losses |  | (491) | 781 | 138
Other changes |  | 0 | 0 | 0
Balance at the end of the period |  |  | 1,658 | 775
Commercial Banking | Allowance for credit losses | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 877 |
Balance at the end of the period |  |  |  | 877
Allowance for credit loss |  |  |  | 102
Commercial Banking | Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 0
Commercial Banking | Reserve for unfunded lending commitments |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 195 | 130 | 118
Provision (benefit) for credit losses |  | (30) | 23 | 12
Balance at the end of the period |  | 165 | 195 | 130
Commercial Banking | Reserve for unfunded lending commitments | Other comprehensive income before reclassifications |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for credit loss |  |  |  | 42
Commercial Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 172 |
Balance at the end of the period |  |  |  | 172
Commercial Banking | Combined allowance and reserve |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 1,853 | 905 |
Balance at the end of the period |  | $ 1,332 | $ 1,853 | $ 905

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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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