v3.26.1
Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 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 $ 1,677   $ 1,608
Unfunded tax credit commitments included in other liabilities 635   567
Loans and letters of credit commitments 756   643
Funded portion of loans and letters of credit commitments 427   $ 328
Tax credits and other tax benefits recognized 62 $ 54  
Tax credit amortization expense included in provision for income taxes $ 51 $ 47  
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] 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)