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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Long-term debt          
Derivatives, Fair Value          
Carrying amount of the hedged items $ 3,838   $ 3,838   $ 2,339
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items (97)   (97)   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 (14)   (14)   $ 0
Interest rate contracts | Interest on long-term debt          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging financial instrument (230) $ (25) (493) $ (124)  
Change in fair value of hedged financial instrument attributable to the risk being hedged 230 25 493 124  
Interest rate contracts | Interest on securities          
Derivatives, Fair Value          
Change in fair value of interest rate swaps hedging financial instrument 0 9 8 9  
Change in fair value of hedged financial instrument attributable to the risk being hedged $ 0 $ (9) $ (8) $ (9)