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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | $ 11,430 |  |
Balance at the end of the period |  | 13,240 | $ 11,430 |
Provision (benefit) for credit losses |  | 5,847 | (1,944) | $ 10,264
Other |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Provision (benefit) for credit losses |  | (6) | (2) | 3
Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 11,430 | 15,564 | 7,208
Allowance build (release) for credit losses |  | 1,827 | (4,146) | 5,013
Other changes |  | (17) | 12 | 36
Balance at the end of the period |  | 13,240 | 11,430 | 15,564
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (6,064) | (4,740) | (7,677)
Recoveries |  | 2,091 | 2,506 | 2,452
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  | (3,973) | (2,234) | (5,225)
Provision (benefit) for credit losses |  | 5,800 | (1,912) | 10,238
Increase (Decrease) in Allowance for Credit Loss |  | 1,800 |  |
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 2,845
Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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 |  | 165 | 195 | 135
Balance at the end of the period |  | 218 | 165 | 195
Provision (benefit) for credit losses |  | 53 | (30) | 23
Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 11,595 | 15,759 |
Balance at the end of the period |  | 13,458 | 11,595 | 15,759
Credit Card | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 8,345 | 11,191 | 5,395
Allowance build (release) for credit losses | $ 327 | 1,217 | (2,858) | 3,057
Other changes |  | (17) | 12 | 36
Balance at the end of the period |  | 9,545 | 8,345 | 11,191
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (4,362) | (3,481) | (5,749)
Recoveries |  | 1,314 | 1,525 | 1,479
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  | (3,048) | (1,956) | (4,270)
Provision (benefit) for credit losses |  | 4,265 | (902) | 7,327
Credit Card | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 2,241
Credit Card | Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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
Balance at the end of the period |  | 0 | 0 | 0
Provision (benefit) for credit losses |  | 0 | 0 | 0
Credit Card | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 8,345 | 11,191 |
Balance at the end of the period |  | 9,545 | 8,345 | 11,191
Consumer Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 1,918 | 2,715 | 1,038
Allowance build (release) for credit losses |  | 319 | (797) | 1,175
Other changes |  | 0 | 0 | 0
Balance at the end of the period |  | 2,237 | 1,918 | 2,715
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (1,614) | (1,211) | (1,534)
Recoveries |  | 760 | 935 | 956
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  | (854) | (276) | (578)
Provision (benefit) for credit losses |  | 1,173 | (521) | 1,753
Consumer Banking | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 502
Consumer Banking | Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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 | 5
Balance at the end of the period |  | 0 | 0 | 0
Provision (benefit) for credit losses |  | 0 | 0 | 0
Consumer Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | (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] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 1,918 | 2,715 |
Balance at the end of the period |  | 2,237 | 1,918 | 2,715
Commercial Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 1,167 | 1,658 | 775
Allowance build (release) for credit losses |  | 291 | (491) | 781
Other changes |  | 0 | 0 | 0
Balance at the end of the period |  | 1,458 | 1,167 | 1,658
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (88) | (48) | (394)
Recoveries |  | 17 | 46 | 17
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  | (71) | (2) | (377)
Provision (benefit) for credit losses |  | 362 | (489) | 1,158
Commercial Banking | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 102
Commercial Banking | Allowance for credit losses | Finance charge and fee reserve reclassification |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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 |  | 165 | 195 | 130
Balance at the end of the period |  | 218 | 165 | 195
Provision (benefit) for credit losses |  | 53 | (30) | 23
Commercial Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  |  | 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] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  | 1,332 | 1,853 |
Balance at the end of the period |  | $ 1,676 | $ 1,332 | $ 1,853

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://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 https://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 https://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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