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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 4,693 | $ 4,741 | $ 4,791 | $ 4,741 | $ 4,741
Charge-offs | (375) | (293) | (705) | (575) |
Recoveries | 113 | 99 | 200 | 186 |
Net (charge-offs) | (262) | (194) | (505) | (389) |
Provision for (recapture of) credit losses | 204 | 189 | 351 | 418 |
Other | 1 | 1 | (1) | 2 |
Ending balance | 4,636 | 4,737 | 4,636 | 4,737 | 4,791
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 672 | 672 | 663 | 694 | 694
Provision for (recapture of) credit losses | 45 | (9) | 54 | (31) |
Ending balance | 717 | 663 | 717 | 663 | 663
Allowance for credit loss | 5,353 | 5,400 | 5,353 | 5,400 | 5,500
Allowances for investment securities and other financial assets | 112 | 171 | 112 | 171 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | (35) | (35)
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 4,693 | 4,741 | 4,791 | 4,706 | 4,706
Ending balance |  |  |  |  | 4,791
Total commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 3,217 | 3,046 | 3,259 | 3,114 | 3,114
Charge-offs | (198) | (135) | (346) | (255) | (442)
Recoveries | 52 | 36 | 75 | 61 |
Net (charge-offs) | (146) | (99) | (271) | (194) |
Provision for (recapture of) credit losses | 172 | 195 | 257 | 220 |
Other |  |  | (2) | 2 |
Ending balance | 3,243 | 3,142 | 3,243 | 3,142 | 3,259
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 528 | 560 | 545 | 613 | 613
Provision for (recapture of) credit losses | 53 | (5) | 36 | (58) |
Ending balance | 581 | 555 | 581 | 555 | 545
Allowance for credit loss | 3,824 | 3,697 | 3,824 | 3,697 |
Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 3,217 | 3,046 | 3,259 | 3,114 | 3,114
Ending balance |  |  |  |  | 3,259
Total consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 1,476 | 1,695 | 1,532 | 1,627 | 1,627
Charge-offs | (177) | (158) | (359) | (320) |
Recoveries | 61 | 63 | 125 | 125 |
Net (charge-offs) | (116) | (95) | (234) | (195) |
Provision for (recapture of) credit losses | 32 | (6) | 94 | 198 |
Other | 1 | 1 | 1 |  |
Ending balance | 1,393 | 1,595 | 1,393 | 1,595 | 1,532
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 144 | 112 | 118 | 81 | 81
Provision for (recapture of) credit losses | (8) | (4) | 18 | 27 |
Ending balance | 136 | 108 | 136 | 108 | 118
Allowance for credit loss | 1,529 | 1,703 | 1,529 | 1,703 |
Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 1,476 | $ 1,695 | $ 1,532 | $ 1,592 | 1,592
Ending balance |  |  |  |  | $ 1,532

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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 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 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
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