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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives $ 22 $ 32
Derivatives 124 109
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 9 13
Derivatives 22 32
Total assets at fair value 31 45
Derivatives 124 109
Total liabilities at fair value 124 109
Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 9 13
Derivatives 0 15
Total assets at fair value 9 28
Derivatives 78 78
Total liabilities at fair value 78 78
Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0 0
Derivatives 22 17
Total assets at fair value 22 17
Derivatives 46 31
Total liabilities at fair value 46 31
Recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0 0
Derivatives 0 0
Total assets at fair value 0 0
Derivatives 0 0
Total liabilities at fair value $ 0 $ 0