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Derivative Instruments Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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 $ 45   $ 45    
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 7 $ 4 12 $ 4  
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 45   45    
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 $ 50   $ 50