v3.26.1
Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
InvestmentProgramProportionalAmortizationMethodElectedIncomeTaxCreditAndOtherIncomeTaxBenefitBeforeAmortizationStatementOfCashFlowsExtensibleEnumerationNotDisclosedFlag     Tax credits and other tax benefits recognized (1) Tax credits and other tax benefits recognized (1)  
Tax Credit Investments | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Tax credit investments included in other assets $ 1,772   $ 1,772   $ 1,608
Unfunded tax credit commitments included in other liabilities 629   629   567
Loans and letters of credit commitments 734   734   643
Funded portion of loans and letters of credit commitments 409   409   $ 328
Tax credits and other tax benefits recognized 66 $ 58 128 $ 112  
Tax credit amortization expense included in provision for income taxes $ 54 $ 48 $ 105 $ 95  
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Other assets   Other assets   Other assets
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]     Income tax expense Income tax expense  
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]     Income tax expense Income tax expense  
InvestmentProgramProportionalAmortizationMethodAppliedIncomeTaxCreditAndOtherTaxBenefitAmortizationStatementOfCashFlowsExtensibleEnumerationNotDisclosedFlag     Tax credit amortization expense included in income tax expense (1) Tax credit amortization expense included in income tax expense (1)