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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 (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | $ 7,208 |
Provision for credit losses | $ 4,246 | $ 1,342 | 9,669 | $ 3,035
Balance at the end of the period | 16,832 |  | 16,832 |
Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 14,073 | 7,313 | 7,208 | 7,220
Charge-offs | (2,131) | (2,157) | (4,588) | (4,430)
Recoveries | 626 | 649 | 1,292 | 1,323
Net charge-offs | (1,505) | (1,508) | (3,296) | (3,107)
Provision for credit losses | 4,252 | 1,329 | 9,619 | 3,013
Allowance build (release) for credit losses | 2,747 | (179) | 6,323 | (94)
Other changes | 12 | (1) | (6) | 7
Balance at the end of the period | 16,832 | 7,133 | 16,832 | 7,133
Allowance for credit losses | Cumulative effects from adoption of the CECL standard |  |  |  |
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 | Balance as of January 1, 2020 |  |  |  |
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 | 223 | 131 | 135 | 122
Provision for credit losses | (5) | 13 | 46 | 22
Balance at the end of the period | 218 | 144 | 218 | 144
Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 37 |
Reserve for unfunded lending commitments | Balance as of January 1, 2020 |  |  |  |
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 | 17,050 | 7,277 | 17,050 | 7,277
Credit Card | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 10,346 | 5,568 | 5,395 | 5,535
Charge-offs | (1,612) | (1,711) | (3,461) | (3,493)
Recoveries | 401 | 391 | 814 | 809
Net charge-offs | (1,211) | (1,320) | (2,647) | (2,684)
Provision for credit losses | 2,944 | 1,095 | 6,646 | 2,484
Allowance build (release) for credit losses | 1,733 | (225) | 3,999 | (200)
Other changes | 12 | (1) | (6) | 7
Balance at the end of the period | 12,091 | 5,342 | 12,091 | 5,342
Credit Card | Allowance for credit losses | Cumulative effects from adoption of the CECL standard |  |  |  |
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 | Balance as of January 1, 2020 |  |  |  |
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 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 the CECL standard |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 0 |
Credit Card | Reserve for unfunded lending commitments | Balance as of January 1, 2020 |  |  |  |
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 | 12,091 | 5,342 | 12,091 | 5,342
Consumer Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 2,154 | 1,062 | 1,038 | 1,048
Charge-offs | (416) | (423) | (912) | (894)
Recoveries | 224 | 251 | 474 | 501
Net charge-offs | (192) | (172) | (438) | (393)
Provision for credit losses | 876 | 165 | 1,736 | 400
Allowance build (release) for credit losses | 684 | (7) | 1,298 | 7
Other changes | 0 | 0 | 0 | 0
Balance at the end of the period | 2,838 | 1,055 | 2,838 | 1,055
Consumer Banking | Allowance for credit losses | Cumulative effects from adoption of the CECL standard |  |  |  |
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 | Balance as of January 1, 2020 |  |  |  |
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 | 4 | 5 | 4
Provision for credit losses | 0 | 0 | 0 | 0
Balance at the end of the period | 0 | 4 | 0 | 4
Consumer Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | (5) |
Consumer Banking | Reserve for unfunded lending commitments | Balance as of January 1, 2020 |  |  |  |
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 | 2,838 | 1,059 | 2,838 | 1,059
Commercial Banking | Allowance for credit losses |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period | 1,573 | 683 | 775 | 637
Charge-offs | (103) | (23) | (215) | (43)
Recoveries | 1 | 7 | 4 | 13
Net charge-offs | (102) | (16) | (211) | (30)
Provision for credit losses | 432 | 69 | 1,237 | 129
Allowance build (release) for credit losses | 330 | 53 | 1,026 | 99
Other changes | 0 | 0 | 0 | 0
Balance at the end of the period | 1,903 | 736 | 1,903 | 736
Commercial Banking | Allowance for credit losses | Cumulative effects from adoption of the CECL standard |  |  |  |
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 | Balance as of January 1, 2020 |  |  |  |
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 | 223 | 127 | 130 | 118
Provision for credit losses | (5) | 13 | 46 | 22
Balance at the end of the period | 218 | 140 | 218 | 140
Commercial Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 42 |
Commercial Banking | Reserve for unfunded lending commitments | Balance as of January 1, 2020 |  |  |  |
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 | $ 2,121 | $ 876 | $ 2,121 | $ 876

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- Definition Financing Receivable, Allowance For Credit Loss, Adjustments, Other + References No definition available. + 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=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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