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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
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | $ 11,430 |
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 677 | $ (823)
Balance at the end of the period | 11,308 |
Other |  |
Allowance for Credit Losses [Roll Forward] |  |
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | (6) | (2)
Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 11,430 | 15,564
Charge-offs | (1,321) | (1,354)
Recoveries | 554 | 614
Net charge-offs | (767) | (740)
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 648 | (813)
Allowance build (release) for credit losses | (119) | (1,553)
Other changes | (3) | 6
Balance at the end of the period | 11,308 | 14,017
Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 165 | 195
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 35 | (8)
Balance at the end of the period | 200 | 187
Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 11,508 | 14,204
Credit Card | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 8,345 | 11,191
Charge-offs | (955) | (993)
Recoveries | 348 | 360
Net charge-offs | (607) | (633)
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 545 | (492)
Allowance build (release) for credit losses | (62) | (1,125)
Other changes | (3) | 6
Balance at the end of the period | 8,280 | 10,072
Credit Card | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 0 | 0
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 0 | 0
Balance at the end of the period | 0 | 0
Credit Card | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 8,280 | 10,072
Consumer Banking | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1,918 | 2,715
Charge-offs | (349) | (342)
Recoveries | 203 | 251
Net charge-offs | (146) | (91)
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 130 | (126)
Allowance build (release) for credit losses | (16) | (217)
Other changes | 0 | 0
Balance at the end of the period | 1,902 | 2,498
Consumer Banking | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 0 | 0
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 0 | 0
Balance at the end of the period | 0 | 0
Consumer Banking | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 1,902 | 2,498
Commercial Banking | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1,167 | 1,658
Charge-offs | (17) | (19)
Recoveries | 3 | 3
Net charge-offs | (14) | (16)
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | (27) | (195)
Allowance build (release) for credit losses | (41) | (211)
Other changes | 0 | 0
Balance at the end of the period | 1,126 | 1,447
Commercial Banking | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 165 | 195
Amounts expected to become due from (to) partners which reduced (increased) provision for credit losses | 35 | (8)
Balance at the end of the period | 200 | 187
Commercial Banking | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | $ 1,326 | $ 1,634

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- Definition Financing Receivable, Allowance For Credit Loss, Adjustments, Other + 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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- 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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- Definition Amount of increase (decrease) in allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: 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 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: 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 + Details
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