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Fair Value Measurements and Disclosures - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Financial Assets:    
Mutual Fund Investments   $ 38
Commodity Derivative Instruments $ 115 180
Financial Liabilities:    
Commodity Derivative Instruments (13) (27)
Portion of Deferred Compensation Liability Measured at Fair Value (48) (43)
Stock Based Compensation Liability Measured at Fair Value (3) (8)
Quoted Prices in Active Markets (Level 1)    
Financial Assets:    
Mutual Fund Investments   38
Commodity Derivative Instruments 0 0
Financial Liabilities:    
Commodity Derivative Instruments 0 0
Portion of Deferred Compensation Liability Measured at Fair Value (48) (43)
Stock Based Compensation Liability Measured at Fair Value (3) (8)
Significant Other Observable Inputs (Level 2)    
Financial Assets:    
Mutual Fund Investments   0
Commodity Derivative Instruments 155 187
Financial Liabilities:    
Commodity Derivative Instruments (53) (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:    
Mutual Fund Investments   0
Commodity Derivative Instruments 0 0
Financial Liabilities:    
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:    
Mutual Fund Investments   0
Commodity Derivative Instruments (40) (7)
Financial Liabilities:    
Commodity Derivative Instruments 40 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:    
Mutual Fund Investments 42  
Mutual Fund Investments | Quoted Prices in Active Markets (Level 1)    
Financial Assets:    
Mutual Fund Investments 42  
Mutual Fund Investments | Significant Other Observable Inputs (Level 2)    
Financial Assets:    
Mutual Fund Investments 0  
Mutual Fund Investments | Significant Unobservable Inputs (Level 3)    
Financial Assets:    
Mutual Fund Investments 0  
Mutual Fund Investments | Scenario, Adjustment    
Financial Assets:    
Mutual Fund Investments $ 0