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Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - Low Income Housing Tax Credit Investments [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Affordable housing tax credit investments included in other assets $ 1,415 $ 1,238  
Unfunded affordable housing tax credit commitments included in other liabilities 592 511  
Loans and letters of credit commitments 730 598  
Funded portion of loans and letters of credit commitments 395 282  
Tax credits and other tax benefits recognized 207 180 $ 165
Tax credit amortization expense included in provision for income taxes $ 166 $ 149 $ 139