v3.26.3
Derivative Financial Instruments - Amounts Related to Fair Value Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Income recognized from securities with terminated hedges $ 10 $ 10 $ 27 $ 29
Fair Value Hedges | Interest Rate Contracts | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet        
Derivative Instruments, Gain (Loss) [Line Items]        
Net interest income (13) 25 (37) 66
Fair Value Hedges | Interest Rate Contracts | Location, Statement of Financial Position, Activity, Capitalization [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecurities | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet        
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts related to settlements 18 78 47 236
Recognized on derivatives 541 (65) 833 (656)
Recognized on hedged items (543) 66 (835) 660
Net interest income 16 79 45 240
Fair Value Hedges | Interest Rate Contracts | Location, Statement of Financial Position, Activity, Capitalization [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet        
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts related to settlements 0 0 (1) (1)
Fair Value Hedges | Interest Rate Contracts | Location, Statement of Financial Position, Activity, Capitalization [Axis]: us-gaap:LongTermDebt | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet        
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts related to settlements (28) (54) (79) (174)
Recognized on derivatives (833) 12 (1,268) 256
Recognized on hedged items 832 (12) 1,266 (255)
Net interest income $ (29) $ (54) $ (81) $ (173)