Operating Segments Operating Segments, Results (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenue, Net	$ 413	$ 293		$ 833	$ 593
Operating Income (Loss)	166	118	[1]	316	237	[1]
Segment Reporting Operating Income Loss	172	123		332	250
Unallocated general and administrative expenses	(6)	(5)		(16)	(13)
Interest and financing costs, net	(59)	(45)		(119)	(89)
Equity in earnings of equity method investments	3	3		5	7
Other income, net	0	0		0	6
Net Earnings	110	76	[1]	202	161	[1],[2]
Additions to Other Assets, Amount	45	60		90	120
NGL sales [Member]
Segment Reporting Information [Line Items]
Revenue, Net	81	27		164	54
Gas gathering and processing [Member]
Segment Reporting Information [Line Items]
Revenue, Net	87	63		167	131
Crude oil and water gathering [Member]
Segment Reporting Information [Line Items]
Revenue, Net	34	32		73	67
Pass-thru and other [Member]
Segment Reporting Information [Line Items]
Revenue, Net	31	28		74	60
Gathering and Processing
Segment Reporting Information [Line Items]
Revenue, Net	233	150		478	312
Operating Income (Loss)	51	55		113	119
Additions to Other Assets, Amount	21	29		39	59
Terminalling [Member]
Segment Reporting Information [Line Items]
Revenue, Net	147	112		292	220
Pipeline transportation [Member]
Segment Reporting Information [Line Items]
Revenue, Net	33	31		63	61
Terminalling and Transportation [Member]
Segment Reporting Information [Line Items]
Revenue, Net	180	143		355	281
Operating Income (Loss)	121	68		219	131
Additions to Other Assets, Amount	$ 24	$ 31		$ 51	$ 61

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

[2] (a)Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.