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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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 $ 5,786   $ 5,786   $ 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 (152)   (152)   (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 (23) $ (131) (114) $ (39)  
Change in fair value of hedged financial instrument attributable to the risk being hedged $ 23 $ 131 $ 114 $ 42