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Fair Value Measurements - Summary of Assets and Liabiliites Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives $ 283 $ 22
Derivatives 12 124
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 53 9
Derivatives 283 22
Total assets at fair value 336 31
Derivatives 12 124
Total liabilities at fair value 12 124
Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 53 9
Derivatives 185 0
Total assets at fair value 238 9
Derivatives 0 78
Total liabilities at fair value 0 78
Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0 0
Derivatives 98 22
Total assets at fair value 98 22
Derivatives 12 46
Total liabilities at fair value 12 46
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