Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		$ 1,781	$ 1,708	[1]
Operating Income (Loss)	[2]	(789)	527	[1]
Total segment revenues and other income		992	2,235	[1],[3]
L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		1,023	904	[1]
G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		758	804	[1]
Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		612	614	[1],[3]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		928	803	[1],[3]
Service [Member] | L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		84	86	[1]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		920	803	[1]
Service [Member] | G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		528	528	[1]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		8	0	[1]
Service, Other [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		39	34	[1],[3]
Service, Other [Member] | L&S
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0	0	[1]
Service, Other [Member] | G&P
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		39	34	[1]
Product [Member]
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		169	216	[3]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		33	41	[1],[3]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue	[2]	169	216	[1]
Product [Member] | L&S
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		4	4	[1]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue		15	11	[1]
Product [Member] | G&P
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		29	37	[1]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue	[2]	$ 154	$ 205	[1]

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

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

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