Description of Business and Basis of Presentation - Additional Information (Details) - Western Gas Partners, LP [Member] - shares			1 Months Ended	6 Months Ended
	Mar. 02, 2015	[1]	Nov. 30, 2014	Jun. 30, 2015
General partner's interest			2.00%	1.80%
Marginal percentage interest in distributions				48.00%
Other Subsidiaries Of Anadarko [Member]
Common units issued				757,619
Non-Operated Marcellus Interest [Member]
Ownership interest				33.75%
Anadarko-Operated Marcellus Interest [Member]
Ownership interest				33.75%
Delaware Basin JV Gathering LLC [Member]
Ownership interest	50.00%			50.00%
Newcastle [Member]
Ownership interest				50.00%
Fort Union [Member]
Equity investment ownership				14.81%
Rendezvous [Member]
Equity investment ownership				22.00%
White Cliffs [Member]
Equity investment ownership				10.00%
Mont Belvieu JV [Member]
Equity investment ownership				25.00%
Texas Express Pipeline LLC [Member]
Equity investment ownership				20.00%
Texas Express Gathering LLC [Member]
Equity investment ownership				20.00%
Front Range Pipeline LLC [Member]
Equity investment ownership				33.33%
Incentive Distribution Rights [Member]
General partner's interest				100.00%
General Partner [Member]
Ownership interest				100.00%

[1] WES acquired Anadarko’s interest in Delaware Basin JV Gathering LLC (“DBJV”), which owns a 50% interest in a gathering system and related facilities (the “DBJV system”). The DBJV system is located in the Delaware Basin in Loving, Ward, Winkler and Reeves Counties, Texas. WES will make a cash payment on March 31, 2020, to Anadarko as consideration for the acquisition of DBJV. WES currently estimates the future payment will be $282.8 million, the net present value of which was $174.3 million as of the acquisition date. See DBJV acquisition—Deferred purchase price obligation - Anadarko below.