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Fair Value Measurements and Disclosures - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financial Assets:    
Investments   $ 38
Commodity Derivative Instruments $ 10 180
Financial Liabilities Fair Value Disclosure [Abstract]    
Commodity Derivative Instruments (83) (27)
Portion of Deferred Compensation Liability Measured at Fair Value (48) (43)
Stock Based Compensation Liability Measured at Fair Value (1) (8)
Quoted Prices in Active Markets (Level 1)    
Financial Assets:    
Investments   38
Commodity Derivative Instruments 0 0
Financial Liabilities Fair Value Disclosure [Abstract]    
Commodity Derivative Instruments 0 0
Portion of Deferred Compensation Liability Measured at Fair Value (48) (43)
Stock Based Compensation Liability Measured at Fair Value (1) (8)
Significant Other Observable Inputs (Level 2)    
Financial Assets:    
Investments   0
Commodity Derivative Instruments 23 187
Financial Liabilities Fair Value Disclosure [Abstract]    
Commodity Derivative Instruments (96) (34)
Portion of Deferred Compensation Liability Measured at Fair Value 0 0
Stock Based Compensation Liability Measured at Fair Value 0 0
Significant Unobservable Inputs (Level 3)    
Financial Assets:    
Investments   0
Commodity Derivative Instruments 0 0
Financial Liabilities Fair Value Disclosure [Abstract]    
Commodity Derivative Instruments 0 0
Portion of Deferred Compensation Liability Measured at Fair Value 0 0
Stock Based Compensation Liability Measured at Fair Value 0 0
Scenario, Adjustment    
Financial Assets:    
Investments   0
Commodity Derivative Instruments (13) (7)
Financial Liabilities Fair Value Disclosure [Abstract]    
Commodity Derivative Instruments 13 7
Portion of Deferred Compensation Liability Measured at Fair Value 0 0
Stock Based Compensation Liability Measured at Fair Value 0 $ 0
Mutual Fund Investments    
Financial Assets:    
Investments 41  
Mutual Fund Investments | Quoted Prices in Active Markets (Level 1)    
Financial Assets:    
Investments 41  
Mutual Fund Investments | Significant Other Observable Inputs (Level 2)    
Financial Assets:    
Investments 0  
Mutual Fund Investments | Significant Unobservable Inputs (Level 3)    
Financial Assets:    
Investments 0  
Mutual Fund Investments | Scenario, Adjustment    
Financial Assets:    
Investments $ 0