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Derivative Financial Instruments - Summary of Classification and Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative asset fair value $ 4 $ 13
Derivative liability fair value (110) (93)
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 3 3
Derivative liability fair value (109) (92)
Designated as Hedging Instrument | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 2 2
Designated as Hedging Instrument | Other accrued liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability fair value (104) (89)
Designated as Hedging Instrument | Other long-term assets    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 1 1
Designated as Hedging Instrument | Other long-term obligations    
Derivatives, Fair Value [Line Items]    
Derivative liability fair value (5) (3)
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 1 10
Derivative liability fair value (1) (1)
Not Designated as Hedging Instrument | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset fair value 1 10
Not Designated as Hedging Instrument | Other accrued liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability fair value $ (1) $ (1)