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Derivative Financial Instruments - Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value      
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt  
Fair Value Hedging | Debt Securities      
Derivatives, Fair Value      
Cumulative amount of fair value hedging adjustments remaining for hedged items for which hedge accounting has been discontinued $ (9) $ (11)  
Fair Value Hedging | Long-term debt      
Derivatives, Fair Value      
Carrying amount of the hedged items 4,838 5,899  
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items (103) (38)  
Fair Value Hedging | Interest rate contracts | Interest on long-term debt      
Derivatives, Fair Value      
Change in fair value of interest rate swaps hedging long-term debt, available-for-sale debt and other securities (66) 29 $ (460)
Change in fair value of hedged long-term debt, available-for-sale debt and other securities attributable to the risk being hedged 65 (26) 460
Fair Value Hedging | Interest rate contracts | Interest on securities      
Derivatives, Fair Value      
Change in fair value of interest rate swaps hedging long-term debt, available-for-sale debt and other securities 0 0 8
Change in fair value of hedged long-term debt, available-for-sale debt and other securities attributable to the risk being hedged $ 0 $ 0 $ (8)