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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