Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		$ 1,756	$ 1,760	$ 5,129		$ 5,185
Rental income		102	99	296		291
Rental income - related parties		241	293	712		904
Income/(loss) from equity method investments(1)		83	95	(1,012)	[1],[2]	255
Other income		2	2	5		6
Other income - related parties		63	31	190		84
Operating Income (Loss)	[3]	491	520	191		1,540
Total segment revenues and other income		2,247	2,280	5,320		6,725
L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		998	998	2,973		2,844
G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		758	762	2,156		2,341
Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		604	632	1,779		1,865
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		909	899	2,694		2,549
Service [Member] | L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		87	95	248		260
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		902	881	2,676		2,527
Service [Member] | G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		517	537	1,531		1,605
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		7	18	18		22
Service, Other [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		41	26	102		86
Service, Other [Member] | L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0	0	0		0
Service, Other [Member] | G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		41	26	102		86
Product [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		165	171	454		576
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		37	32	100		109
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		165	171	454		576
Product [Member] | L&S
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		2	8	10		17
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		7	14	39		40
Product [Member] | G&P
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		35	24	90		92
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		$ 158	$ 157	$ 415		$ 536

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

[2] The nine months ended September 30, 2020 includes $1,264 million of impairment expense. See Note 4.

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