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Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - Tax Credit Investments [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]      
Tax credit investments included in other assets $ 1,453   $ 1,415
Unfunded tax credit commitments included in other liabilities 558   592
Loans and letters of credit commitments 719   730
Funded portion of loans and letters of credit commitments 414   $ 395
Tax credits and other tax benefits recognized 55 $ 51  
Tax credit amortization expense included in provision for income taxes $ 46 $ 41