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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 5,361 | $ 2,742 |  |
Charge-offs | (243) | (304) |  |
Recoveries | 97 | 92 |  |
Net (charge-offs) | (146) | (212) |  |
Provision for (recapture of) credit losses | (502) | 952 |  |
Other | 1 | (1) |  |
Ending balance | 4,714 | 3,944 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 584 | 318 |  |
Provision for (recapture of) credit losses | (77) | (47) |  |
Ending balance | 507 | 450 |  |
Allowance for credit loss | 5,221 | 4,394 | $ 5,945 | $ 3,060
Allowances for investment securities and other financial assets | 136 | 21 |  |
Total commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 3,337 | 1,812 |  |
Charge-offs | (69) | (83) |  |
Recoveries | 18 | 24 |  |
Net (charge-offs) | (51) | (59) |  |
Provision for (recapture of) credit losses | (204) | 531 |  |
Other | 1 | (1) |  |
Ending balance | 3,083 | 1,979 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 485 | 316 |  |
Provision for (recapture of) credit losses | (82) | (25) |  |
Ending balance | 403 | 344 |  |
Allowance for credit loss | 3,486 | 2,323 | 3,822 | 2,128
Total consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 2,024 | 930 |  |
Charge-offs | (174) | (221) |  |
Recoveries | 79 | 68 |  |
Net (charge-offs) | (95) | (153) |  |
Provision for (recapture of) credit losses | (298) | 421 |  |
Ending balance | 1,631 | 1,965 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 99 | 2 |  |
Provision for (recapture of) credit losses | 5 | (22) |  |
Ending balance | 104 | 106 |  |
Allowance for credit loss | 1,735 | 2,071 | $ 2,123 | $ 932
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 463 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance |  | 179 |  |
Cumulative Effect, Period of Adoption, Adjustment | Total commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | (304) |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance |  | 53 |  |
Cumulative Effect, Period of Adoption, Adjustment | Total consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 767 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance |  | 126 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 5,361 | 3,205 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 584 | 497 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Total commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 3,337 | 1,508 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 485 | 369 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Total consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 2,024 | 1,697 |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | $ 99 | $ 128 |  |

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- Definition Debt Securities, Available-For-Sale And Held-To-Maturity, And Other Financial Assets, Allowance for Credit Loss + References No definition available. + Details
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- Definition Total allowance for credit losses related to loans, including the allowance for loan and lease losses and allowance for unfunded lending related commitments + 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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