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Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]          
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]     Income tax expense Income tax expense  
Tax Credit Investments | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Tax credit investments included in other assets $ 1,529   $ 1,529   $ 1,471
Unfunded tax credit commitments included in other liabilities 515   515   590
Loans and letters of credit commitments 568   568   663
Funded portion of loans and letters of credit commitments 302   302   $ 336
Tax credits and other tax benefits recognized 58 $ 61 112 $ 116  
Tax credit amortization expense included in provision for income taxes $ 48 $ 47 $ 95 $ 93