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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Allowance for Loan and Lease Losses and Reserve for Unfunded Lending Commitments Activity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | $ 15,564 |
Provision (benefit) for credit losses | (823) | $ 5,423
Balance at the end of the period | 14,017 |
Other |  |
Allowance for Credit Losses [Roll Forward] |  |
Provision (benefit) for credit losses | (2) | 5
Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 15,564 | 7,208
Charge-offs | (1,354) | (2,457)
Recoveries | 614 | 666
Net charge-offs | (740) | (1,791)
Provision (benefit) for credit losses | (813) | 5,367
Allowance build (release) for credit losses | (1,553) | 3,576
Other changes | 6 | (18)
Balance at the end of the period | 14,017 | 14,073
Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 2,845
Allowance for credit losses | Finance charge and fee reserve reclassification |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 462
Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 10,515
Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 195 | 135
Provision (benefit) for credit losses | (8) | 51
Balance at the end of the period | 187 | 223
Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 37
Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 172
Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 14,204 | 14,296
Credit Card | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 11,191 | 5,395
Charge-offs | (993) | (1,849)
Recoveries | 360 | 413
Net charge-offs | (633) | (1,436)
Provision (benefit) for credit losses | (492) | 3,702
Allowance build (release) for credit losses | (1,125) | 2,266
Other changes | 6 | (18)
Balance at the end of the period | 10,072 | 10,346
Credit Card | Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 2,241
Credit Card | Allowance for credit losses | Finance charge and fee reserve reclassification |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 462
Credit Card | Allowance for credit losses | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 8,098
Credit Card | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 0 | 0
Provision (benefit) for credit losses | 0 | 0
Balance at the end of the period | 0 | 0
Credit Card | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 0
Credit Card | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 0
Credit Card | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 10,072 | 10,346
Consumer Banking | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 2,715 | 1,038
Charge-offs | (342) | (496)
Recoveries | 251 | 250
Net charge-offs | (91) | (246)
Provision (benefit) for credit losses | (126) | 860
Allowance build (release) for credit losses | (217) | 614
Other changes | 0 | 0
Balance at the end of the period | 2,498 | 2,154
Consumer Banking | Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 502
Consumer Banking | Allowance for credit losses | Finance charge and fee reserve reclassification |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning 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 the beginning of the period |  | 1,540
Consumer Banking | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 0 | 5
Provision (benefit) for credit losses | 0 | 0
Balance at the end of the period | 0 | 0
Consumer Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | (5)
Consumer Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 0
Consumer Banking | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 2,498 | 2,154
Commercial Banking | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 1,658 | 775
Charge-offs | (19) | (112)
Recoveries | 3 | 3
Net charge-offs | (16) | (109)
Provision (benefit) for credit losses | (195) | 805
Allowance build (release) for credit losses | (211) | 696
Other changes | 0 | 0
Balance at the end of the period | 1,447 | 1,573
Commercial Banking | Allowance for credit losses | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 102
Commercial Banking | Allowance for credit losses | Finance charge and fee reserve reclassification |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning 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 the beginning of the period |  | 877
Commercial Banking | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period | 195 | 130
Provision (benefit) for credit losses | (8) | 51
Balance at the end of the period | 187 | 223
Commercial Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of new accounting standards |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 42
Commercial Banking | Reserve for unfunded lending commitments | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the beginning of the period |  | 172
Commercial Banking | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | $ 1,634 | $ 1,796

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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=121599337&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=121647567&loc=SL82922352-210448 + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + 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)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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