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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
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Long-term debt          
Derivatives, Fair Value          
Carrying amount of the hedged items $ 1,855   $ 1,855   $ 2,478
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 410   410   534
Available-for-sale debt and other securities          
Derivatives, Fair Value          
Carrying amount of the hedged items 467   467   0
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items (9)   (9)   $ 0
Interest rate contracts | Interest on long-term debt          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging available-for-sale debt and other securities (25) $ (39) (124) $ 187  
Change in fair value of hedged available-for-sale debt and other securities attributable to the risk being hedged 25 39 124 (186)  
Interest rate contracts | Interest on securities          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging available-for-sale debt and other securities 9 0 9 0  
Change in fair value of hedged available-for-sale debt and other securities attributable to the risk being hedged $ (9) $ 0 $ (9) $ 0