Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues (including revenues from affiliates (Note 13)):
Total Revenues	$ 515	$ 735	$ 1,163	$ 1,530
Cost and Expenses (including expenses from affiliates (Note 13)):
Cost of natural gas and natural gas liquids (excluding depreciation and amortization shown separately)	177	317	403	695
Operation and maintenance	115	99	217	202
General and administrative	21	25	45	51
Depreciation and amortization	105	110	209	215
Impairments (Note 7)	0	0	28	0
Taxes other than income tax	17	17	35	35
Total Cost and Expenses	435	568	937	1,198
Operating Income	80	167	226	332
Other Income (Expense):
Interest expense	(46)	(48)	(93)	(94)
Equity in earnings of equity method affiliate	5	4	11	7
Other, net	5	1	5	1
Total Other Expense	(36)	(43)	(77)	(86)
Income Before Income Tax
Income Before Income Tax	44	124	149	246
Income tax benefit	0	0	0	(1)
Net Income
Net Income	44	124	149	247
Less: Net (loss) income attributable to noncontrolling interest
Less: Net (loss) income attributable to noncontrolling interest	0	0	(7)	1
Net Income Attributable to Limited Partners
Net Income Attributable to Limited Partners	44	124	156	246
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 Units (Note 5)
Net Income Attributable to Common Units (Note 5)	35	115	138	228
Common Unit [Member]
Net Income Attributable to Common Units (Note 5)
Net Income Attributable to Common Units (Note 5)	$ 35	$ 115	$ 138	$ 228
Basic and Diluted earnings per unit and weighted average number of units outstanding
Basic earnings per unit (Note 5)	$ 0.08	$ 0.26	$ 0.32	$ 0.52
Diluted earnings per unit (Note 5)	$ 0.08	$ 0.26	$ 0.30	$ 0.52
Product
Revenues (including revenues from affiliates (Note 13)):
Total Revenues	$ 196	$ 393	$ 484	$ 836
Natural Gas, Gathering, Transportation, Marketing and Processing
Revenues (including revenues from affiliates (Note 13)):
Total Revenues	$ 319	$ 342	$ 679	$ 694