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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 4,741 | $ 4,868 | $ 5,361
Acquisition PCD reserves |  |  | 1,056
Charge-offs | (1,092) | (985) | (1,101)
Recoveries | 382 | 422 | 444
Net (charge-offs) | (710) | (563) | (657)
Provision for (recapture of) credit losses | 792 | 439 | (887)
Other | 3 | (3) | (5)
Ending balance | 4,791 | 4,741 | 4,868
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 694 | 662 | 584
Acquisition PCD reserves |  |  | 46
Provision for (recapture of) credit losses | (31) | 32 | 32
Ending balance | 663 | 694 | 662
Allowance for credit loss and off-balance sheet liability | 5,454 | 5,435 | 5,530
Allowances for investment securities and other financial assets | 120 | 176 | 171
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | (35) |  |
Ending balance |  | (35) |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 4,706 | 4,868 | 5,361
Ending balance |  | 4,706 | 4,868
Commercial |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,114 | 3,185 | 3,337
Acquisition PCD reserves |  |  | 774
Charge-offs | (442) | (307) | (434)
Recoveries | 137 | 114 | 106
Net (charge-offs) | (305) | (193) | (328)
Provision for (recapture of) credit losses | 447 | 126 | (594)
Other | 3 | (4) | (4)
Ending balance | 3,259 | 3,114 | 3,185
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 613 | 564 | 485
Acquisition PCD reserves |  |  | 43
Provision for (recapture of) credit losses | (68) | 49 | 36
Ending balance | 545 | 613 | 564
Allowance for credit loss and off-balance sheet liability | 3,804 | 3,727 | 3,749
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance |  |  |
Ending balance |  |  |
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,114 | 3,185 | 3,337
Ending balance |  | 3,114 | 3,185
Consumer |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 1,627 | 1,683 | 2,024
Acquisition PCD reserves |  |  | 282
Charge-offs | (650) | (678) | (667)
Recoveries | 245 | 308 | 338
Net (charge-offs) | (405) | (370) | (329)
Provision for (recapture of) credit losses | 345 | 313 | (293)
Other |  | 1 | (1)
Ending balance | 1,532 | 1,627 | 1,683
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 81 | 98 | 99
Acquisition PCD reserves |  |  | 3
Provision for (recapture of) credit losses | 37 | (17) | (4)
Ending balance | 118 | 81 | 98
Allowance for credit loss and off-balance sheet liability | 1,650 | 1,708 | 1,781
Consumer | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | (35) |  |
Ending balance |  | (35) |
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 1,592 | 1,683 | 2,024
Ending balance |  | $ 1,592 | $ 1,683

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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