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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | $ 15,564 |
Provision (benefit) for credit losses | $ (1,160) | $ 4,246 | (1,983) | $ 9,669
Balance at the end of the period | 12,346 |  | 12,346 |
Other |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Provision (benefit) for credit losses | 0 | (1) | (2) | 4
Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 14,017 | 14,073 | 15,564 | 7,208
Charge-offs | (1,235) | (2,131) | (2,589) | (4,588)
Recoveries | 694 | 626 | 1,308 | 1,292
Net charge-offs | (541) | (1,505) | (1,281) | (3,296)
Provision (benefit) for credit losses | (1,137) | 4,252 | (1,950) | 9,619
Allowance build (release) for credit losses | (1,678) | 2,747 | (3,231) | 6,323
Other changes | 7 | 12 | 13 | (6)
Balance at the end of the period | 12,346 | 16,832 | 12,346 | 16,832
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 | 187 | 223 | 195 | 135
Provision (benefit) for credit losses | (23) | (5) | (31) | 46
Balance at the end of the period | 164 | 218 | 164 | 218
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 | 12,510 | 17,050 | 12,510 | 17,050
Credit Card | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 10,072 | 10,346 | 11,191 | 5,395
Charge-offs | (967) | (1,612) | (1,960) | (3,461)
Recoveries | 396 | 401 | 756 | 814
Net charge-offs | (571) | (1,211) | (1,204) | (2,647)
Provision (benefit) for credit losses | (635) | 2,944 | (1,127) | 6,646
Allowance build (release) for credit losses | (1,206) | 1,733 | (2,331) | 3,999
Other changes | 7 | 12 | 13 | (6)
Balance at the end of the period | 8,873 | 12,091 | 8,873 | 12,091
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 | 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] |  |  |  |
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 | 8,873 | 12,091 | 8,873 | 12,091
Consumer Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 2,498 | 2,154 | 2,715 | 1,038
Charge-offs | (260) | (416) | (602) | (912)
Recoveries | 271 | 224 | 522 | 474
Net charge-offs | 11 | (192) | (80) | (438)
Provision (benefit) for credit losses | (306) | 876 | (432) | 1,736
Allowance build (release) for credit losses | (295) | 684 | (512) | 1,298
Other changes | 0 | 0 | 0 | 0
Balance at the end of the period | 2,203 | 2,838 | 2,203 | 2,838
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 | 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] |  |  |  |
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 | 2,203 | 2,838 | 2,203 | 2,838
Commercial Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 1,447 | 1,573 | 1,658 | 775
Charge-offs | (8) | (103) | (27) | (215)
Recoveries | 27 | 1 | 30 | 4
Net charge-offs | 19 | (102) | 3 | (211)
Provision (benefit) for credit losses | (196) | 432 | (391) | 1,237
Allowance build (release) for credit losses | (177) | 330 | (388) | 1,026
Other changes | 0 | 0 | 0 | 0
Balance at the end of the period | 1,270 | 1,903 | 1,270 | 1,903
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 | 187 | 223 | 195 | 130
Provision (benefit) for credit losses | (23) | (5) | (31) | 46
Balance at the end of the period | 164 | 218 | 164 | 218
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 | $ 1,434 | $ 2,121 | $ 1,434 | $ 2,121

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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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