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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Derivatives, Fair Value          
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Long-term debt   Long-term debt   Long-term debt
Fair Value Hedging          
Derivatives, Fair Value          
Carrying amount of the hedged items $ 5,825   $ 5,825   $ 5,865
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 (106)   (106)   (64)
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 (12)   (12)   $ (14)
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 (131) $ (111) (39) $ (263)  
Change in fair value of hedged financial instrument attributable to the risk being hedged 131 111 42 263  
Fair Value Hedging | Interest rate contracts | Interest on securities          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging financial instrument 0 0 0 8  
Change in fair value of hedged financial instrument attributable to the risk being hedged $ 0 $ 0 $ 0 $ (8)