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Fair Value Measurements - Summary of Assets and Liabiliites Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives $ 11 $ 283
Derivatives 74 12
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 63 53
Derivatives 11 283
Total assets at fair value 74 336
Derivatives 74 12
Total liabilities at fair value 74 12
Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 63 53
Derivatives 1 185
Total assets at fair value 64 238
Derivatives 26 0
Total liabilities at fair value 26 0
Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities 0 0
Derivatives 10 98
Total assets at fair value 10 98
Derivatives 48 12
Total liabilities at fair value 48 12
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