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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										$ 5,007
Rental income										349	$ 277	$ 298
Other Operating Income										(3)	(24)	(42)
Total revenues and other income		$ 1,715	$ 1,712	$ 1,578	$ 1,420	$ 1,085	$ 980	$ 916	$ 886	6,425	3,867	3,029
Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										1,704	1,156	958
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties										2,159	1,082	936
Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										198	0	0
Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										902	889	572
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue	[1]									897
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties										49	$ 8	$ 11
Logistics and Storage [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										2,303
Logistics and Storage [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										130
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties										2,159
Logistics and Storage [Member] | Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										0
Logistics and Storage [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue										7
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties										7
Gathering and Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										2,704
Gathering and Processing [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										1,574
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties										0
Gathering and Processing [Member] | Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										198
Gathering and Processing [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue	[1]									890
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties										42
Other Income [Member]
Disaggregation of Revenue [Line Items]
Other Operating Income										$ 5
[1] G&P “Product sales” for the year ended December 31, 2018 excludes approximately $5 million of impact related to derivative gains and mark-to-market adjustments.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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