Consolidated Statements of Partners' Equity - USD ($) $ in Millions		Total		Equity of Predecessors		Common	Preferred	General Partner	Non-controlling Interest
Balance at Beginning of Period, Partnership at Dec. 31, 2015		$ 2,242		$ 464	[1]	$ 1,707	$ 0	$ (13)	$ 84
Partners' Capital
Sponsor contributions of equity to the Predecessors		515		515	[1]	0	0	0	0
Loss attributable to Predecessors		(62)		(62)	[1]	0	0	0	0
Net liabilities not assumed by Andeavor Logistics LP		(22)		(22)	[1]	0	0	0	0
Allocation of net assets acquired by the unitholders		0		(322)	[1]	310	0	12	0
Equity offering under ATM Program, net of issuance costs		71		0	[1]	71	0	0	0
Proceeds from issuance of units, net of issuance costs		293		0	[1]	293	0	0	0
Quarterly distributions to unitholders and general partner		(461)		0	[1]	(324)	0	(137)	0
Distributions to unitholders related to acquisitions		(765)		0	[1]	(679)	0	(86)	0
Contributions		42		0	[1]	39	0	3	0
Net Earnings Attributable to Partners		339		0	[1]	187	0	152	0
Partners' Capital Account, Exchanges and Conversions		(84)		0	[1]	0	0	0	(84)
Other		7		0	[1]	4	0	3	0
Balance at End of Period, Partnership at Dec. 31, 2016		2,159		617	[1]	1,608	0	(66)	0
Partners' Capital
Sponsor contributions of equity to the Predecessors		2,464		2,464	[1]	0	0	0	0
Loss attributable to Predecessors		(43)		(43)	[1]	0	0	0	0
Net liabilities not assumed by Andeavor Logistics LP		0
Allocation of net assets acquired by the unitholders		0		(1,713)	[1]	1,713	0	0	0
Proceeds from issuance of units, net of issuance costs		879		0	[1]	284	589	6	0
Partners' Capital Account, Unit-based Compensation	[1]	5		0		5	0	0	0
Quarterly distributions to unitholders and general partner		(661)		(33)	[1]	(501)	0	(127)	0
Distributions to unitholders related to acquisitions		(401)		0	[1]	(401)	0	0	0
Contributions		53		0	[1]	50	0	3	0
Net Earnings Attributable to Partners		349		0	[1]	229	0	120	0
Partners' Capital Account, Exchanges and Conversions		0		0	[1]	(60)	0	60	0
Other		2		0	[1]	(2)	0	4	0
Balance at End of Period, Partnership at Dec. 31, 2017		4,806	[2]	1,292	[1]	2,925	589	0	0
Partners' Capital
Sponsor contributions of equity to the Predecessors		374		374	[1]	0	0	0	0
Loss attributable to Predecessors		(28)		(28)	[1]	0	0	0	0
Net liabilities not assumed by Andeavor Logistics LP		(13)		(13)	[1]	0	0	0	0
Allocation of net assets acquired by the unitholders		0		(1,651)	[1]	1,651	0	0	0
Partners' Capital Account, Unit-based Compensation		9		0	[1]	9	0	0	0
Quarterly distributions to unitholders and general partner		(888)		0	[1]	(859)	(29)	0	0
Distributions to unitholders related to acquisitions		(300)		0	[1]	(300)	0	0	0
Contributions		81		0	[1]	81	0	0	0
Net Earnings Attributable to Partners		628		0	[1]	584	44	0	0
Partners' Capital Account, Exchanges and Conversions		(17)		0	[1]	(17)	0	0	0
Other		(4)		0	[1]	(4)	0	0	0
Balance at End of Period, Partnership at Dec. 31, 2018		$ 4,674		$ 0	[1]	$ 4,070	$ 604	$ 0	$ 0

[1] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.

[2] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.