Segment Information - Segment Adjusted EBITDA (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Segment Reporting Information [Line Items]
Depreciation and amortization	[1]	$ 325		$ 301	[2],[3],[4]
Total revenues from contracts with customers		1,781		1,708	[5]
Rental income		96		99	[3]
Income/(loss) from equity method investments(2)		(1,184)	[6],[7],[8]	77	[2],[3],[4],[9]
Other income		1		0	[3]
Total segment revenues and other income		(992)		(2,235)	[3],[5]
Investments in unconsolidated affiliates		(91)		(135)	[2]
L&S
Segment Reporting Information [Line Items]
Depreciation and amortization		(138)		(126)
Total revenues from contracts with customers		1,023		904	[5]
Investments in unconsolidated affiliates		54		7	[4]
G&P
Segment Reporting Information [Line Items]
Depreciation and amortization		(187)		(175)
Total revenues from contracts with customers		758		804	[5]
Investments in unconsolidated affiliates		37		128	[4]
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA		1,294		930	[4]
Operating Segments | L&S
Segment Reporting Information [Line Items]
Rental income		242		335	[4]
Income/(loss) from equity method investments(2)		50		45	[4]
Other income		51		12	[4]
Total segment revenues and other income	[1]	(1,366)		(1,296)	[4]
Adjusted EBITDA	[10]	872		559	[4]
Capital Expenditure		184		198	[4]
Operating Segments | G&P
Segment Reporting Information [Line Items]
Rental income		88		89	[4]
Income/(loss) from equity method investments(2)		(1,234)		32	[4]
Other income		14		14	[4]
Total segment revenues and other income	[1]	374		(939)	[4]
Adjusted EBITDA	[10]	422		371	[4]
Capital Expenditure		134		306	[4]
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA attributable to Predecessor	[11]	0		333	[4]
Service [Member]
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		612		614	[3],[5]
Service [Member] | L&S
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		84		86	[5]
Service [Member] | G&P
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		528		528	[5]
Service [Member] | Operating Segments | L&S
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		1,004		889	[4]
Service [Member] | Operating Segments | G&P
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		536		528	[4]
Product [Member]
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		169		216	[3]
Product [Member] | Operating Segments | L&S
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		19		15	[4]
Product [Member] | Operating Segments | G&P
Segment Reporting Information [Line Items]
Total revenues from contracts with customers		222		276	[4]
Third Party [Member] | L&S
Segment Reporting Information [Line Items]
Total segment revenues and other income		(158)		(153)
Third Party [Member] | G&P
Segment Reporting Information [Line Items]
Total segment revenues and other income		$ (425)		$ (887)

[1] Within the total segment revenues and other income amounts presented above, third party revenues for the L&S segment were $158 million and $153 million for the three months ended March 31, 2020 and 2019, respectively. Third party losses for the G&P segment were $425 million for the three months ended March 31, 2020 and third party revenues were $887 million for the three months ended March 31, 2019.

[2] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[3] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[4] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[5] Financial information for the first quarter of 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 2020 period includes $1,264 million of impairment expense. See Note 4.

[8] Includes the impact of any basis differential amortization or accretion in addition to the impairment of $1,264 million.

[9] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

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

[11] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.