Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		$ 1,592	$ 1,717	[1]	$ 3,373		$ 3,425	[1]
Rental income		98	93	[2]	194		192	[2]
Rental income - related parties		237	286	[2]	471		611	[2]
Income/(loss) from equity method investments(2)		89	83	[2],[3]	(1,095)	[4],[5]	160	[2],[6]
Other income		2	4	[2]	3		4	[2]
Other income - related parties		63	27	[2]	127		53	[2]
Operating Income (Loss)	[7]	489	493	[1]	(300)		1,020	[1]
Total segment revenues and other income		2,081	2,210	[1],[2]	3,073		4,445	[1],[2]
L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		952	942	[1]	1,975		1,846	[1]
G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		640	775	[1]	1,398		1,579	[1]
Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		563	619	[1],[2]	1,175		1,233	[1],[2]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		857	847	[1],[2]	1,785		1,650	[1],[2]
Service [Member] | L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		77	79	[1]	161		165	[1]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		854	843	[1]	1,774		1,646	[1]
Service [Member] | G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		486	540	[1]	1,014		1,068	[1]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		3	4	[1]	11		4	[1]
Service, Other [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		22	26	[1],[2]	61		60	[1],[2]
Service, Other [Member] | L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0	0	[1]	0		0	[1]
Service, Other [Member] | G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		22	26	[1]	61		60	[1]
Product [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		120	189	[2]	289		405	[2]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		30	36	[1],[2]	63		77	[1],[2]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		120	189	[1]	289		405	[1]
Product [Member] | L&S
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		4	5	[1]	8		9	[1]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		17	15	[1]	32		26	[1]
Product [Member] | G&P
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		26	31	[1]	55		68	[1]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		$ 103	$ 174	[1]	$ 257		$ 379	[1]

[1] 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.

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

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

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

[7] Non-ASC 606 Revenue includes rental income, income/(loss) from equity method investments, derivative gains and losses, mark-to-market adjustments, and other income.