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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Long-term debt          
Derivatives, Fair Value          
Carrying amount of the hedged items $ 3,072   $ 3,072   $ 2,339
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 133   133   396
Available-for-sale debt and other securities          
Derivatives, Fair Value          
Carrying amount of the hedged items 0   0   465
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items 0   0   (8)
Cumulative amount of fair value hedging adjustments remaining for hedged items for which hedge accounting has been discontinued (15)   (15)   $ 0
Interest rate contracts | Interest on long-term debt          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging financial instrument (111) $ 46 (263) $ (99)  
Change in fair value of hedged financial instrument attributable to the risk being hedged 111 (46) 263 99  
Interest rate contracts | Interest on securities          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging financial instrument 0 0 8 0  
Change in fair value of hedged financial instrument attributable to the risk being hedged $ 0 $ 0 $ (8) $ 0