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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
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Long-term debt      
Derivatives, Fair Value      
Carrying amount of the hedged items $ 2,187   $ 2,339
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 244   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 (15)   $ 0
Interest rate contracts | Interest on long-term debt      
Derivatives, Fair Value      
Change in fair value of interest rate swaps hedging financial instrument (152) $ (145)  
Change in fair value of hedged financial instrument attributable to the risk being hedged 152 145  
Interest rate contracts | Interest on securities      
Derivatives, Fair Value      
Change in fair value of interest rate swaps hedging financial instrument 8 0  
Change in fair value of hedged financial instrument attributable to the risk being hedged $ (8) $ 0