Segment Disclosures, Results (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information
Cash and cash equivalents		$ 688				$ 16				$ 688	$ 16	$ 19	$ 23
Revenues
Affiliate										715	615	497
Third-party										505	497	103
Total revenues		319	$ 308	$ 293	$ 300	292	$ 282	$ 275	$ 263	1,220	1,112	600
Operating Income (Loss)		123	$ 127	$ 118	$ 119	97	$ 100	$ 97	$ 99	487	393	164
Segment Reporting Operating Income Loss										540	447	203
Interest and financing costs, net										(191)	(150)	(109)
Equity in earnings of equity method investments										13	7	1
Other Income, net										6	0	0
Identifiable Assets
Total Assets		5,860				5,131				5,860	5,131
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest										315	250	56
Depreciation and amortization expenses										190	187	85
Crude Oil Gathering [Member]
Revenues
Affiliate										81	89	105
Third-party										258	250	30
Total revenues										339	339	135
Operating Income (Loss)										132	142	47
Identifiable Assets
Total Assets		1,765				1,850				1,765	1,850
Depreciation and amortization expenses										62	67	11
Capital expenditures										99	213	156
Processing
Revenues
Affiliate										98	96	7
Third-party										178	182	16
Total revenues										276	278	23
Operating Income (Loss)										111	105	6
Identifiable Assets
Total Assets		1,627				1,619				1,627	1,619
Depreciation and amortization expenses										45	44	4
Capital expenditures										20	15	4
Terminalling and Transportation
Revenues
Affiliate	[1]									536	430	385
Third-party										69	65	57
Total revenues										605	495	442
Operating Income (Loss)										297	200	150
Identifiable Assets
Total Assets		1,768				1,641				1,768	1,641
Depreciation and amortization expenses										83	76	70
Capital expenditures										154	158	112
Corporate, Non-Segment [Member]
Revenues
Unallocated general and administrative expenses										53	54	39
Identifiable Assets
Total Assets	[2]	$ 700				$ 21				700	21
4610 Pipe Lines (No Natural Gas)
Identifiable Assets
Depreciation and amortization expenses												85
Capital expenditures										$ 273	$ 386	$ 272

[1] Our Predecessors did not record revenue for transactions with Tesoro in the Terminalling and Transportation segment for assets acquired in the Acquisitions from Tesoro prior to the effective date of each acquisition, except for the RCA tariffs charged to Tesoro on the refined products pipeline included in the acquisition of the West Coast Logistics Assets.

[2] Other consists mainly of $688 million in cash and cash equivalents as of December 31, 2016, which was used to fund the acquisition of the North Dakota Gathering and Processing Assets on January 1, 2017.