Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) branded_wholesale_site in Thousands, bbl / d in Thousands, gal / yr in Millions, $ in Millions			12 Months Ended
		Jan. 01, 2019 USD ($)	Dec. 31, 2019 USD ($) gal / yr bbl / d refinery ethanol_plant branded_wholesale_site
New Accounting Pronouncements [Line Items]
Number of petroleum refineries owned and operated | refinery			15
Combined total throughput capacity of petroleum refining (barrels per day) | bbl / d			3,150
Number of ethanol plants owned and operated | ethanol_plant			14
Combined capacity of ethanol (gallons per year) | gal / yr			1,730
Number of branded wholesale sites | branded_wholesale_site			7
Recognition of ROU assets and lease liabilities for operating leases	[1]		$ 1,756
Topic 842 [Member]
New Accounting Pronouncements [Line Items]
Recognition of ROU assets and lease liabilities for operating leases		$ 1,300
Topic 842 [Member] | MVP Terminal [Member]
New Accounting Pronouncements [Line Items]
Derecognition of existing assets under construction related to build-to-suit lease arrangement		$ 539
Grain Processing Equipment [Member]
New Accounting Pronouncements [Line Items]
Property, plant, and equipment, useful life			20 years
Minimum [Member]
New Accounting Pronouncements [Line Items]
Property, plant, and equipment, useful life			20 years
Typical post-delivery payment terms (in days)			2 days
Maximum [Member]
New Accounting Pronouncements [Line Items]
Property, plant, and equipment, useful life			30 years
Typical post-delivery payment terms (in days)			10 days

[1] Includes noncash activity of $1.3 billion for operating lease ROU assets recorded on January 1, 2019 upon adoption of Topic 842.