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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Offsetting Assets and Liabilities (Details) - Commodity Derivatives - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Current Assets    
Derivative Assets    
Commodity Derivatives $ 7 $ 3
Less: Counterparty Netting (4) (3)
Total Net Fair Value of Derivatives 3 0
Current Liabilities    
Derivative Liabilities    
Commodity Derivatives (4) (11)
Less: Counterparty Netting 4 3
Total Net Fair Value of Derivatives $ 0 $ (8)