Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues (including revenues from affiliates (Note 12)):
Total Revenues	$ 805	$ 626	$ 1,553	$ 1,292
Cost of Goods and Services Sold	444	279	819	587
Cost and Expenses (including expenses from affiliates (Note 12)):
Operation and maintenance	97	97	191	186
General and administrative	26	23	53	48
Depreciation and amortization	96	89	192	177
Taxes other than income tax	16	16	33	32
Total Cost and Expenses	679	504	1,288	1,030
Operating Income	126	122	265	262
Other Income (Expense):
Interest expense	(36)	(31)	(69)	(58)
Equity in earnings of equity method affiliate	7	7	13	14
Other Nonoperating Income (Expense)	(2)	(1)	0	0
Total Other Expense	(31)	(25)	(56)	(44)
Income Before Income Tax
Income Before Income Tax	95	97	209	218
Income tax expense	0	1	0	2
Net Income
Net Income	95	96	209	216
Less: Net income attributable to noncontrolling interest
Less: Net income attributable to noncontrolling interest	0	1	0	1
Net Income Attributable to Limited Partners
Net Income Attributable to Limited Partners	95	95	209	215
Less: Series A Preferred Unit distributions (Note 6)
Less: Series A Preferred Unit distributions (Note 6)	9	9	18	18
Net Income Attributable to Common and Subordinated Units (Note 5)
Net Income Attributable to Common and Subordinated Units (Note 5)	86	86	191	197
Common Units
Net Income Attributable to Common and Subordinated Units (Note 5)
Net Income Attributable to Common and Subordinated Units (Note 5)	$ 86	$ 45	$ 191	$ 102
Basic and Diluted earnings (loss) per unit and weighted average number of units outstanding
Basic earnings per unit (Note 5)	$ 0.20	$ 0.20	$ 0.44	$ 0.45
Diluted earnings per unit (Note 5)	$ 0.20	$ 0.20	$ 0.44	$ 0.45
Subordinated Units
Net Income Attributable to Common and Subordinated Units (Note 5)
Net Income Attributable to Common and Subordinated Units (Note 5)	$ 0	$ 41	$ 0	$ 95
Basic and Diluted earnings (loss) per unit and weighted average number of units outstanding
Basic earnings per unit (Note 5)	$ 0.00	$ 0.20	$ 0.00	$ 0.46
Diluted earnings per unit (Note 5)	$ 0.00	$ 0.20	$ 0.00	$ 0.46
Product
Revenues (including revenues from affiliates (Note 12)):
Total Revenues	$ 501	$ 354	$ 944	$ 740
Natural Gas, Gathering, Transportation, Marketing and Processing
Revenues (including revenues from affiliates (Note 12)):
Total Revenues	$ 304	$ 272	$ 609	$ 552