Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Property Plant And Equipment Estimated Useful Life

We compute depreciation of property, plant and equipment using the straight-line method, based on the estimated useful life of each asset as follows: 

Assets	Lives in Years
Refining	8 to 47
Logistics	3 to 30
Retail	14 to 18
Corporate	3 to 7
Software	3