Note 11 - Equity and Net Earnings per Unit Equity, Allocation of General Partner (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Net Earnings Attributable to Partners		$ 628	$ 349		$ 339
Distributions on Preferred Units (c)	[1]	(41)	(3)		0
Special Allocation		0	1	[2]	3	[2]
Net Earnings Available To Partners		$ 587	$ 272		$ 194
General partner’s ownership interest	[3]	0.00%	0.00%		2.00%
Loss attributable to Predecessors		$ (28)	$ (43)		$ (62)
Net Income (Loss) Allocated to General Partners		0	(79)		(152)
General Partner
Net Earnings Attributable to Partners		0	120		152
General partner's IDRs		0	(75)	[4]	(148)	[4]
Net Income (Loss) Allocated To General Partners, Excluding Incentive Distribution	[5]	0	4		4
Loss attributable to Predecessors		0	0		0
Net Income (Loss) Allocated to General Partners		$ (28)	$ 36		$ 90

[1] The Preferred Units entitle unitholders to receive preferred distributions on a semi-annually basis.

[2] Normal allocations according to percentage interests are made after giving effect, if any, to priority income allocations in an amount equal to incentive cash distributions fully allocated to the general partner and any special allocations. The adjustment reflects the special allocation to common units held by TLGP for the interest incurred in connection with borrowings on the Dropdown Credit Facility in lieu of using cash on hand to fund the North Dakota Gathering and Processing Assets in 2017 and the Alaska Storage and Terminalling Assets acquisition in 2016.

[3] In connection with the IDR/GP Transaction, our general partner units converted into non-economic general partner units.

[4] 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.

[5] Prior to the IDR/GP Transaction, we allocated net earnings to our general partner based on its ownership interest.