Segment Information - Reconciliation to Net Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization	[1]	$ (325)		$ (301)	[2],[3],[4]
Income Tax Expense (Benefit)		0		1	[3],[4]
Amortization of Debt Issuance Costs		(14)		(7)	[2]
Share-based Payment Arrangement, Expense		(5)		(7)	[4]
Goodwill and Intangible Asset Impairment		(2,165)		0	[2],[3],[4]
Interest and Other Financial Costs		(216)		(217)	[4]
Income/(loss) from equity method investments(2)		(1,184)	[5],[6],[7]	77	[2],[3],[4],[8]
Proceeds from Equity Method Investment, Distribution, Return of Capital		(119)		(115)	[2]
Acquisition Costs, Period Cost		0		(1)	[4]
Other Cost and Expense, Operating		1		0	[4]
Net income		(2,716)		689	[2],[3],[4],[9]
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA		1,294		930	[4]
Amortization of Debt Issuance Costs		(14)		(7)	[4]
Segment Reconciling Items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Proceeds from Equity Method Investment, Distribution, Return of Capital		(124)		(122)	[4]
Adjusted EBITDA attributable to noncontrolling interests		9		7	[4]
L&S
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization		138		126
L&S | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	[10]	872		559	[4]
Income/(loss) from equity method investments(2)		50		45	[4]
G&P
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization		187		175
G&P | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	[10]	422		371	[4]
Income/(loss) from equity method investments(2)		(1,234)		32	[4]
Not Designated as Hedging Instrument [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	[10]	$ 15		$ (4)	[4]

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

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

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

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

[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.