v3.26.1
Derivatives and Hedging Activities (Derivatives in Statement of Income and Impact on Interest) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain/(loss) on derivatives $ 17 $ (15)
Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 13 (24)
Net interest settlements    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 4 10
Total net gain/(loss) related to derivatives not designated as hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 17 (14)
Price Alignment Amount    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0 $ (1)