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Financial and Derivative Instruments (Details1) - Commodity - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Assets at Fair Value $ 22 $ 283
Total Liabilities at Fair Value 63 12
Accounts and notes receivable, net    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Assets at Fair Value 22 279
Long-term receivables, net    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Assets at Fair Value 0 4
Accounts payable    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Liabilities at Fair Value 63 12
Deferred credits and other noncurrent obligations    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Liabilities at Fair Value $ 0 $ 0