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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 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 | $ (342) | $ 331 | (2,325) | $ 10,000 |
Balance at the end of the period | 11,573 |  | 11,573 |  |
Financing Receivable Allowance for credit loss Translation Adjustments and Purchase Credit Deteriorated Loans | 6 |  | 6 |  |
Other |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Provision (benefit) for credit losses | 0 | (2) | (2) | 2 |
Allowance for credit losses |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 12,346 | 16,832 | 15,564 | 7,208 |
Charge-offs | (1,019) | (1,679) | (3,608) | (6,267) |
Recoveries | 593 | 606 | 1,901 | 1,898 |
Net charge-offs | (426) | (1,073) | (1,707) | (4,369) |
Provision (benefit) for credit losses | (344) | 356 | (2,294) | 9,975 |
Allowance build (release) for credit losses | (770) | (717) | (4,001) | 5,606 |
Other changes | (3) | 14 | 10 | 8 |
Balance at the end of the period | 11,573 | 16,129 | 11,573 | 16,129 |
Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
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
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 10,515 |
Reserve for unfunded lending commitments |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 164 | 218 | 195 | 135 |
Provision (benefit) for credit losses | 2 | (23) | (29) | 23 |
Balance at the end of the period | 166 | 195 | 166 | 195 |
Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |  |  |  |
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 |
Combined allowance and reserve |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at the end of the period | 11,739 | 16,324 | 11,739 | 16,324 |
Credit Card | Allowance for credit losses |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 8,873 | 12,091 | 11,191 | 5,395 |
Charge-offs | (735) | (1,296) | (2,695) | (4,757) |
Recoveries | 369 | 353 | 1,125 | 1,167 |
Net charge-offs | (366) | (943) | (1,570) | (3,590) |
Provision (benefit) for credit losses | (198) | 450 | (1,325) | 7,096 |
Allowance build (release) for credit losses | (564) | (493) | (2,895) | 3,506 |
Other changes | (3) | 14 | 10 | 8 |
Balance at the end of the period | 8,306 | 11,612 | 8,306 | 11,612 |
Credit Card | Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
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 | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 8,098 |
Credit Card | Reserve for unfunded lending commitments |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 0 | 0 | 0 | 0 |
Provision (benefit) for credit losses | 0 | 0 | 0 | 0 |
Balance at the end of the period | 0 | 0 | 0 | 0 |
Credit Card | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |  |  |  |
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 |
Credit Card | Combined allowance and reserve |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at the end of the period | 8,306 | 11,612 | 8,306 | 11,612 |
Consumer Banking | Allowance for credit losses |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 2,203 | 2,838 | 2,715 | 1,038 |
Charge-offs | (264) | (295) | (866) | (1,207) |
Recoveries | 213 | 247 | 735 | 721 |
Net charge-offs | (51) | (48) | (131) | (486) |
Provision (benefit) for credit losses | (91) | (43) | (523) | 1,693 |
Allowance build (release) for credit losses | (142) | (91) | (654) | 1,207 |
Other changes | 0 | 0 | 0 | 0 |
Balance at the end of the period | 2,061 | 2,747 | 2,061 | 2,747 |
Consumer Banking | Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
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 | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 1,540 |
Consumer Banking | Reserve for unfunded lending commitments |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 0 | 0 | 0 | 5 |
Provision (benefit) for credit losses | 0 | 0 | 0 | 0 |
Balance at the end of the period | 0 | 0 | 0 | 0 |
Consumer Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |  |  |  |
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 |
Consumer Banking | Combined allowance and reserve |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at the end of the period | 2,061 | 2,747 | 2,061 | 2,747 |
Commercial Banking | Allowance for credit losses |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1,270 | 1,903 | 1,658 | 775 |
Charge-offs | (20) | (88) | (47) | (303) |
Recoveries | 11 | 6 | 41 | 10 |
Net charge-offs | (9) | (82) | (6) | (293) |
Provision (benefit) for credit losses | (55) | (51) | (446) | 1,186 |
Allowance build (release) for credit losses | (64) | (133) | (452) | 893 |
Other changes | 0 | 0 | 0 | 0 |
Balance at the end of the period | 1,206 | 1,770 | 1,206 | 1,770 |
Commercial Banking | Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
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 | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 877 |
Commercial Banking | Reserve for unfunded lending commitments |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 164 | 218 | 195 | 130 |
Provision (benefit) for credit losses | 2 | (23) | (29) | 23 |
Balance at the end of the period | 166 | 195 | 166 | 195 |
Commercial Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |  |  |  |
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 |
Commercial Banking | Combined allowance and reserve |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at the end of the period | $ 1,372 | $ 1,965 | $ 1,372 | $ 1,965 |

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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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
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