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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 4,523 | $ 4,636 | $ 4,486 | $ 4,791 | $ 4,791
Charge-offs | (284) | (376) | (920) | (1,081) |
Recoveries | 105 | 90 | 338 | 290 |
Net (charge-offs) | (179) | (286) | (582) | (791) |
Provision for credit losses | 136 | 235 | 567 | 586 |
Other | (2) | 4 | 7 | 3 |
Ending balance | 4,478 | 4,589 | 4,478 | 4,589 | 4,486
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 759 | 717 | 719 | 663 | 663
Provision for (recapture of) credit losses | 16 | 7 | 54 | 61 |
Other | 0 | 1 | 2 | 1 |
Ending balance | 775 | 725 | 775 | 725 | 719
Allowance for credit loss | 5,253 | 5,314 | 5,253 | 5,314 | 5,200
Allowances for investment securities and other financial assets | 101 | 111 | 101 | 111 |
Commercial Portfolio Segment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 3,230 | 3,243 | 3,148 | 3,259 | 3,259
Charge-offs | (116) | (200) | (410) | (546) | (720)
Recoveries | 44 | 28 | 152 | 103 |
Net (charge-offs) | (72) | (172) | (258) | (443) |
Provision for credit losses | 23 | 151 | 282 | 408 |
Other | (3) | 4 | 6 | 2 |
Ending balance | 3,178 | 3,226 | 3,178 | 3,226 | 3,148
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 616 | 581 | 580 | 545 | 545
Provision for (recapture of) credit losses | 18 | (2) | 52 | 34 |
Other | (1) | 1 | 1 | 1 |
Ending balance | 633 | 580 | 633 | 580 | 580
Allowance for credit loss | 3,811 | 3,806 | 3,811 | 3,806 |
Consumer Portfolio Segment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 1,293 | 1,393 | 1,338 | 1,532 | 1,532
Charge-offs | (168) | (176) | (510) | (535) |
Recoveries | 61 | 62 | 186 | 187 |
Net (charge-offs) | (107) | (114) | (324) | (348) |
Provision for credit losses | 113 | 84 | 285 | 178 |
Other | 1 | 0 | 1 | 1 |
Ending balance | 1,300 | 1,363 | 1,300 | 1,363 | 1,338
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 143 | 136 | 139 | 118 | 118
Provision for (recapture of) credit losses | (2) | 9 | 2 | 27 |
Other | 1 | 0 | 1 | 0 |
Ending balance | 142 | 145 | 142 | 145 | $ 139
Allowance for credit loss | $ 1,442 | $ 1,508 | $ 1,442 | $ 1,508 |

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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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