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Derivatives and Hedging Instruments - Gain (Loss) on Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax $ (1) $ 0
Unrealized gains (loss) on derivatives 57 0
Interest Rate Contract | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Investments 57 0
Interest Rate Contract | Cash Flow Hedging | Cost of service    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax $ 1 $ 0