For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Basis of Presentation Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Variable Interest Entity
Earnings (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 8	$ (1)	$ 8	$ 10
Hawaii Operations
Variable Interest Entity
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	13	1	13	16
Earnings (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 8	$ 1	$ 8	$ 10
Logistics \| Andeavor Logistics [Member]
Variable Interest Entity
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			33.00%		34.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest			2.00%		2.00%
Percentage of revenues from Andeavor	49.00%	60.00%	49.00%	58.00%
Logistics \| Western Refining Logistics [Member]
Variable Interest Entity
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			52.00%
Percentage of revenues from Andeavor	38.00%		37.00%