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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]          
Tax credit investments included in other assets $ 1,479   $ 1,479   $ 1,415
Unfunded tax credit commitments included in other liabilities 566   566   592
Loans and letters of credit commitments 680   680   730
Funded portion of loans and letters of credit commitments 428   428   $ 395
Tax credits and other tax benefits recognized 61 $ 49 116 $ 100  
Tax credit amortization expense included in provision for income taxes $ 47 $ 42 $ 93 $ 83