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Financial and Derivative Instruments (Details 1) - Commodity - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (21) $ 164
Sales and other operating revenues    
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (12) 162
Purchased crude oil and products    
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (9) 4
Other income    
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0 $ (2)