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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) bbl / d in Millions, $ in Millions, gal / yr in Billions	12 Months Ended
	Dec. 31, 2016 USD ($) gal / yr bbl / d refineries plants segments branded_wholesale_sites	Dec. 31, 2015 USD ($)
ASSETS
Deferred charges and other assets, net	$ 2,901	$ 2,626
Liabilities
Debt and capital lease obligations, less current portion	7,886	7,208
Deferred income taxes, currently reported	$ 7,361	7,060
Basis of Presentation and Summary of Significant Accounting Policies (Textual)
Number of petroleum refineries owned | refineries	15
Combined total throughput capacity of petroleum refining (barrels per day) | bbl / d	3.1
Number of branded wholesale sites | branded_wholesale_sites	7,400
Number of ethanol plants owned | plants	11
Combined capacity of ethanol (gallons per year) | gal / yr	1.4
Number of reportable segments | segments	2
Minimum [Member]
Basis of Presentation and Summary of Significant Accounting Policies (Textual)
Property, plant, and equipment, useful life	25 years
Maximum [Member]
Basis of Presentation and Summary of Significant Accounting Policies (Textual)
Property, plant, and equipment, useful life	30 years
Adjustments for New Accounting Pronouncement [Member]
ASSETS
Deferred charges and other assets, net		2,626
Liabilities
Debt and capital lease obligations, less current portion		7,208
Deferred income taxes, currently reported		7,060
Adjustments for New Accounting Pronouncement [Member] | Previously Reported [Member]
ASSETS
Current deferred income tax assets		74
Deferred charges and other assets, net		2,668
Liabilities
Current deferred income tax		366
Debt and capital lease obligations, less current portion		7,250
Deferred income taxes		6,768
Adjustments for New Accounting Pronouncement [Member] | Reclassifications [Member]
ASSETS
Current deferred income tax assets		(74)
Deferred charges and other assets, net		(42)
Liabilities
Current deferred income tax		(366)
Debt and capital lease obligations, less current portion		(42)
Deferred income taxes		$ 292

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