Segment Information - Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 321	[1]	$ 313	[1],[2],[3]	$ 646		$ 614	[2],[4]
Total revenues from contracts with customers	1,592		1,717	[5]	3,373		3,425	[5]
Rental income	98		93	[2]	194		192	[2]
Income/(loss) from equity method investments(2)	89		83	[2],[3]	(1,095)	[6],[7]	160	[2],[4]
Other income	2		4	[2]	3		4	[2]
Total segment revenues and other income	(2,081)		(2,210)	[2],[5]	(3,073)		(4,445)	[2],[5]
Investments in unconsolidated affiliates					(222)		(323)	[4]
L&S
Segment Reporting Information [Line Items]
Depreciation and amortization	138		134		276		260
Total revenues from contracts with customers	952		942	[5]	1,975		1,846	[5]
Investments in unconsolidated affiliates	(74)		(61)		(128)		(68)
G&P
Segment Reporting Information [Line Items]
Depreciation and amortization	183		179		370		354
Total revenues from contracts with customers	640		775	[5]	1,398		1,579	[5]
Investments in unconsolidated affiliates	(57)		(127)		(94)		(255)
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	1,227		920	[3]	2,521		1,850
Operating Segments | L&S
Segment Reporting Information [Line Items]
Rental income	246		296	[3]	488		631
Income/(loss) from equity method investments(2)	40		54	[3]	90		99
Other income	52		16	[3]	103		28
Total segment revenues and other income	(1,290)	[1]	(1,308)	[1],[3]	(2,656)		(2,604)
Adjusted EBITDA	839	[8]	570	[3],[8]	1,711		1,129
Capital Expenditure	108		230	[3]	292		428	[3]
Operating Segments | G&P
Segment Reporting Information [Line Items]
Rental income	89		83	[3]	177		172
Income/(loss) from equity method investments(2)	49		29	[3]	(1,185)		61
Other income	13		15	[3]	27		29
Total segment revenues and other income	(791)	[1]	(902)	[1],[3]	(417)		(1,841)
Adjusted EBITDA	388	[8]	350	[3],[8]	810		721
Capital Expenditure	110		326	[3]	244		632	[3]
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA attributable to Predecessor	0	[9]	329	[3],[9]	0		662
Service [Member]
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	563		619	[2],[5]	1,175		1,233	[2],[5]
Service [Member] | L&S
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	77		79	[5]	161		165	[5]
Service [Member] | G&P
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	486		540	[5]	1,014		1,068	[5]
Service [Member] | Operating Segments | L&S
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	931		922	[3]	1,935		1,811
Service [Member] | Operating Segments | G&P
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	489		544	[3]	1,025		1,072
Product [Member]
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	120		189	[2]	289		405	[2]
Product [Member] | Operating Segments | L&S
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	21		20	[3]	40		35
Product [Member] | Operating Segments | G&P
Segment Reporting Information [Line Items]
Total revenues from contracts with customers	151		231	[3]	373		507
Third Party [Member] | L&S
Segment Reporting Information [Line Items]
Total segment revenues and other income	(146)		(163)		(304)		(316)
Third Party [Member] | G&P
Segment Reporting Information [Line Items]
Total segment revenues and other income	$ (748)		$ (851)		$ (323)		$ (1,738)

[1] Within the total segment revenues and other income amounts presented above, third party revenues for the L&S segment were $146 million and $304 million for the three and six months ended June 30, 2020, respectively, and $163 million and $316 million for the three and six months ended June 30, 2019, respectively. Third party revenues for the G&P segment were $748 million and $323 million for the three and six months ended June 30, 2020, respectively, and $851 million and $1,738 million for the three and six months ended June 30, 2019, respectively.

[2] Financial information for the three and six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[3] Financial information for the three and six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[4] Financial information for the six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[5] Financial information for the three and six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[6] The 2020 period includes $1,264 million of impairment expense. See Note 4.

[7] The six months ended June 30, 2020 includes $1,264 million of impairment expense. See Note 4.

[8] See below for the reconciliation from Segment Adjusted EBITDA to net income.

[9] Financial information for the three and six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.