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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Long-term debt      
Derivatives, Fair Value      
Carrying amount of the hedged items $ 2,339 $ 2,478  
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 396 534  
Available-for-sale debt and other securities      
Derivatives, Fair Value      
Carrying amount of the hedged items 465 0  
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items (8) 0  
Interest rate contracts | Interest on long-term debt      
Derivatives, Fair Value      
Change in fair value of interest rate swaps hedging long-term debt (138) 134 $ 152
Change in fair value of hedged long-term debt attributable to the risk being hedged 138 (133) (147)
Interest rate contracts | Interest on securities      
Derivatives, Fair Value      
Change in fair value of interest rate swaps hedging long-term debt 7 0 0
Change in fair value of hedged long-term debt attributable to the risk being hedged $ (7) $ 0 $ 0