Basis of Presentation (Details) $ in Millions		6 Months Ended
	May 16, 2018 USD ($)	Jun. 30, 2018
Business Acquisition, Contingent Consideration [Line Items]
Parent, limited partner ownership percentage		74.00%
WPZ Merger Public Unit Exchange [Member]
Business Acquisition, Contingent Consideration [Line Items]
Termination Fee	$ 410
WPZ Merger Public Unit Exchange [Member] | Merger Closed Prior To Third Quarter 2018 Dividend Record Date [Member]
Business Acquisition, Contingent Consideration [Line Items]
Conversion Ratio	1.494
WPZ Merger Public Unit Exchange [Member] | Merger Closed After Third Quarter 2018 Dividend Record Date [Member]
Business Acquisition, Contingent Consideration [Line Items]
Conversion Ratio	1.513