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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
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivatives, Fair Value          
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Long-term debt   Long-term debt   Long-term debt
Fair Value Hedging | Long-term debt          
Derivatives, Fair Value          
Carrying amount of the hedged items $ 5,977   $ 5,977   $ 5,899
Fair Value Hedging | Long-term debt          
Derivatives, Fair Value          
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 38   38   (38)
Fair Value Hedging | Available-for-sale debt and other securities          
Derivatives, Fair Value          
Cumulative amount of fair value hedging adjustments remaining for hedged items for which hedge accounting has been discontinued (10)   (10)   $ (11)
Fair Value Hedging | Interest rate contracts | Interest on long-term debt          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging financial instrument 190 $ (147) 76 $ (186)  
Change in fair value of hedged financial instrument attributable to the risk being hedged $ (190) $ 146 $ (76) $ 188