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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 4,791 | $ 4,741 | $ 4,868
Charge-offs | (1,435) | (1,092) | (985)
Recoveries | 394 | 382 | 422
Net (charge-offs) | (1,041) | (710) | (563)
Provision for credit losses | 741 | 792 | 439
Other | (5) | 3 | (3)
Ending balance | 4,486 | 4,791 | 4,741
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 663 | 694 | 662
Provision for (recapture of) credit losses | 56 | (31) | 32
Other |  |  |
Ending balance | 719 | 663 | 694
Allowance for credit loss and off-balance sheet liability | 5,205 | 5,454 | 5,435
Allowances for investment securities and other financial assets | 114 | 120 | 176
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 | 4,791 | 4,706 | 4,868
Ending balance |  | 4,791 | 4,706
Commercial |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,259 | 3,114 | 3,185
Charge-offs | (720) | (442) | (307)
Recoveries | 149 | 137 | 114
Net (charge-offs) | (571) | (305) | (193)
Provision for credit losses | 464 | 447 | 126
Other | (4) | 3 | (4)
Ending balance | 3,148 | 3,259 | 3,114
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 545 | 613 | 564
Provision for (recapture of) credit losses | 36 | (68) | 49
Other | (1) |  |
Ending balance | 580 | 545 | 613
Allowance for credit loss and off-balance sheet liability | 3,728 | 3,804 | 3,727
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 | 3,259 | 3,114 | 3,185
Ending balance |  | 3,259 | 3,114
Consumer |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 1,532 | 1,627 | 1,683
Charge-offs | (715) | (650) | (678)
Recoveries | 245 | 245 | 308
Net (charge-offs) | (470) | (405) | (370)
Provision for credit losses | 277 | 345 | 313
Other | (1) |  | 1
Ending balance | 1,338 | 1,532 | 1,627
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 118 | 81 | 98
Provision for (recapture of) credit losses | 20 | 37 | (17)
Other | 1 |  |
Ending balance | 139 | 118 | 81
Allowance for credit loss and off-balance sheet liability | 1,477 | 1,650 | 1,708
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 | $ 1,532 | 1,592 | 1,683
Ending balance |  | $ 1,532 | $ 1,592

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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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- 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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