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Derivative Financial Instruments - Summary of Classification and Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative asset fair value $ 42 $ 13
Derivative liability fair value (6) (93)
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 42 3
Derivative liability fair value (6) (92)
Designated as Hedging Instrument | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 40 2
Designated as Hedging Instrument | Other accrued liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability fair value (5) (89)
Designated as Hedging Instrument | Other long-term assets    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 2 1
Designated as Hedging Instrument | Other long-term obligations    
Derivatives, Fair Value [Line Items]    
Derivative liability fair value (1) (3)
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 0 10
Derivative liability fair value 0 (1)
Not Designated as Hedging Instrument | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 0 10
Not Designated as Hedging Instrument | Other accrued liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability fair value $ 0 $ (1)