Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues (including revenues from affiliates (Note 13)):
Total Revenues	$ 596	$ 699	$ 1,759	$ 2,229
Cost and Expenses (including expenses from affiliates (Note 13)):
Cost of natural gas and natural gas liquids (excluding depreciation and amortization shown separately)	250	263	653	958
Operation and maintenance	96	105	313	307
General and administrative	28	31	73	82
Depreciation and amortization	105	108	314	323
Impairments of property, plant and equipment and goodwill (Note 7)	0	0	28	0
Taxes other than income tax	17	17	52	52
Total Cost and Expenses	496	524	1,433	1,722
Operating Income	100	175	326	507
Other Income (Expense):
Interest expense	(43)	(48)	(136)	(142)
Equity in earnings (losses) of equity method affiliate, net	(222)	5	(211)	12
Other, net	2	1	7	2
Total Other Expense	(263)	(42)	(340)	(128)
Income (Loss) Before Income Tax
Income (Loss) Before Income Tax	(163)	133	(14)	379
Income tax benefit	0	0	0	(1)
Net Income (Loss)
Net Income (Loss)	(163)	133	(14)	380
Less: Net income (loss) attributable to noncontrolling interest
Less: Net income (loss) attributable to noncontrolling interest	1	1	(6)	2
Net Income (Loss) Attributable to Limited Partners
Net Income (Loss) Attributable to Limited Partners	(164)	132	(8)	378
Less: Series A Preferred Unit distributions (Note 6)
Less: Series A Preferred Unit distributions (Note 6)	9	9	27	27
Net Income (Loss) Attributable to Common Units (Note 5)
Net Income (Loss) Attributable to Common Units (Note 5)	(173)	123	(35)	351
Common Unit [Member]
Net Income (Loss) Attributable to Common Units (Note 5)
Net Income (Loss) Attributable to Common Units (Note 5)	$ (173)	$ 123	$ (35)	$ 351
Basic and Diluted earnings per unit and weighted average number of units outstanding
Basic earnings (loss) per unit (Note 5)	$ (0.40)	$ 0.28	$ (0.08)	$ 0.81
Diluted earnings (loss) per unit (Note 5)	$ (0.40)	$ 0.28	$ (0.08)	$ 0.81
Product
Revenues (including revenues from affiliates (Note 13)):
Total Revenues	$ 280	$ 320	$ 764	$ 1,156
Natural Gas, Gathering, Transportation, Marketing and Processing
Revenues (including revenues from affiliates (Note 13)):
Total Revenues	$ 316	$ 379	$ 995	$ 1,073