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Derivative Financial Instruments - Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Details) - Fair Value Hedging - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Long-term debt      
Derivatives, Fair Value      
Carrying amount of the hedged items $ 5,865 $ 2,339  
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items (64) 396  
Available-for-sale debt and other securities      
Derivatives, Fair Value      
Carrying amount of the hedged items 0 465  
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 0 (8)  
Cumulative amount of fair value hedging adjustments remaining for hedged items for which hedge accounting has been discontinued (14) 0  
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 (460) (138) $ 134
Change in fair value of hedged long-term debt, available-for-sale debt and other securities attributable to the risk being hedged 460 138 (133)
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 8 7 0
Change in fair value of hedged long-term debt, available-for-sale debt and other securities attributable to the risk being hedged $ (8) $ (7) $ 0