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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 4,868 | $ 5,361 | $ 2,742
Acquisition PCD reserves |  | 1,056 |
Charge-offs | (985) | (1,101) | (1,192)
Recoveries | 422 | 444 | 360
Net (charge-offs) | (563) | (657) | (832)
Provision for (recapture of) credit losses | 439 | (887) | 2,985
Other | (3) | (5) | 3
Ending balance | 4,741 | 4,868 | 5,361
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 662 | 584 | 318
Acquisition PCD reserves |  | 46 |
Provision for (recapture of) credit losses | 32 | 32 | 87
Ending balance | 694 | 662 | 584
Allowance for credit loss and off-balance sheet liability | 5,435 | 5,530 | 5,945
Allowances for investment securities and other financial assets | 176 | 171 | 109
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance |  |  | 463
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance |  |  | 179
Ending balance |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 4,868 | 5,361 | 3,205
Ending balance |  | 4,868 | 5,361
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 662 | 584 | 497
Ending balance |  | 662 | 584
Commercial |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,185 | 3,337 | 1,812
Acquisition PCD reserves |  | 774 |
Charge-offs | (307) | (434) | (407)
Recoveries | 114 | 106 | 94
Net (charge-offs) | (193) | (328) | (313)
Provision for (recapture of) credit losses | 126 | (594) | 2,139
Other | (4) | (4) | 3
Ending balance | 3,114 | 3,185 | 3,337
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 564 | 485 | 316
Acquisition PCD reserves |  | 43 |
Provision for (recapture of) credit losses | 49 | 36 | 116
Ending balance | 613 | 564 | 485
Allowance for credit loss and off-balance sheet liability | 3,727 | 3,749 | 3,822
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance |  |  | (304)
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance |  |  | 53
Ending balance |  |  |
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,185 | 3,337 | 1,508
Ending balance |  | 3,185 | 3,337
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 564 | 485 | 369
Ending balance |  | 564 | 485
Consumer |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 1,683 | 2,024 | 930
Acquisition PCD reserves |  | 282 |
Charge-offs | (678) | (667) | (785)
Recoveries | 308 | 338 | 266
Net (charge-offs) | (370) | (329) | (519)
Provision for (recapture of) credit losses | 313 | (293) | 846
Other | 1 | (1) |
Ending balance | 1,627 | 1,683 | 2,024
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 98 | 99 | 2
Acquisition PCD reserves |  | 3 |
Provision for (recapture of) credit losses | (17) | (4) | (29)
Ending balance | 81 | 98 | 99
Allowance for credit loss and off-balance sheet liability | 1,708 | 1,781 | 2,123
Consumer | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance |  |  | 767
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance |  |  | 126
Ending balance |  |  |
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 1,683 | 2,024 | 1,697
Ending balance |  | 1,683 | 2,024
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | $ 98 | 99 | 128
Ending balance |  | $ 98 | $ 99

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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 excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + 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 https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + 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 (e) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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