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Derivative Instruments Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Aug. 31, 2018
SCL Senior Notes [Member]      
Derivative [Line Items]      
Cumulative fair value hedging adjustment included in the carrying amount of the SCL Senior Notes $ 33    
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Derivative, notional amount     $ 5,500
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Expense [Member]      
Derivative [Line Items]      
Derivative, realized gain on interest rate swaps 14 $ 2  
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]      
Derivative [Line Items]      
Derivative asset 33    
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivative [Line Items]      
Derivative, fair value $ 43