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Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - Tax Credit Investments - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |  |  |  |
Tax credit investments included in other assets | $ 1,495 |  | $ 1,495 |  | $ 1,415
Unfunded tax credit commitments included in other liabilities | 589 |  | 589 |  | 592
Loans and letters of credit commitments | 674 |  | 674 |  | 730
Funded portion of loans and letters of credit commitments | 346 |  | 346 |  | $ 395
Tax credits and other tax benefits recognized | 59 | $ 51 | 175 | $ 151 |
Tax credit amortization expense included in provision for income taxes | $ 49 | $ 42 | $ 142 | $ 125 |

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- Definition Amount, before amortization expense, of income tax credit and other tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 323 -SubTopic 740 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/323-740-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A + Details
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