Debt Total Debt (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	[1]	$ 7,730	$ 7,042
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[2]	(69)	(109)
Long-term Debt and Capital Lease Obligations, Current		(28)	(465)
Debt, Net of Unamortized Issuance Costs	[3]	7,633	6,468
Andeavor Logistics [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations		3,800	$ 4,100
Western Refining Logistics [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations		320
7.5%SeniorNotesdue2023 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		326
Debt Instrument, Unamortized Premium		$ 25

[1] Total debt related to Andeavor Logistics, which is non-recourse to Andeavor, except for TLGP, was $3.8 billion and $4.1 billion at September 30, 2017 and December 31, 2016, respectively. Total debt related to WNRL, which is non-recourse to Andeavor, except for WNRL General Partner, was $320 million at September 30, 2017.

[2] Includes premium of $25 million related to the incremental fair value of the WNRL senior notes upon acquisition.

[3] Increase primarily related to borrowings on our Revolving Credit Facility for the Western Refining Acquisition and WNRL’s outstanding debt. See Note 2.