Note 11 - Equity and Net Earnings per Unit Equity, Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Distribution Made to Limited Partner, Cash Distributions Declared			$ (890)	$ (611)		$ (344)
General Partner Distributions			0	(81)		(158)
Distribution Made To Partners, Total Cash Distributions			(890)	(692)		(502)
Distributions to preferred unitholders			29	0		0	[1]
Subsequent Event
Distribution Made to Limited Partner, Declaration Date		Jan. 25, 2019
Distribution Made to Limited Partner, Date of Record		Feb. 05, 2019
Distribution Made to Limited Partner, Distribution Date		Feb. 14, 2019
Distributions to preferred unitholders		$ 21
General Partner
General Partner Distributions			0	(6)		(10)
General partner's IDRs			0	(75)	[2]	(148)	[2]
Common
Distribution Made to Limited Partner, Cash Distributions Declared	[3]		$ (890)	$ (611)		$ (344)
Common | Subsequent Event
Distribution Made to Limited Partner, Cash Distributions Declared		$ (238)
Cash distributions paid per unit		$ 1.03

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

[2] IDRs entitled the general partner to receive increasing percentages, up to 50%, of quarterly distributions in excess of $0.3881 per unit per quarter. The amount above reflects earnings distributed to our general partner net of $50 million of IDRs for the year ended December 31, 2017 waived by TLGP. Our general partner no longer holds IDRs as a result of the IDR/GP Transaction.

[3] Distributions of earnings for limited partners’ common units for the years ended December 31, 2018 and 2017 is net of a $60 million and $25 million waiver, respectively, from our Sponsor in connection with the WNRL Merger.