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Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Presentation of WES assets policy	Presentation of WES assets. References to “WES assets” refer collectively to the assets indirectly owned by WGP, through its partnership interests in WES, as of March 31, 2013. Because Anadarko controls WES through its ownership and control of WGP, which owns WES GP, each of WES's acquisitions of assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, WES assets acquired from Anadarko were initially recorded at Anadarko's historic carrying value, which did not correlate to the total acquisition price paid by WES. Further, after an acquisition of assets from Anadarko, WES and WGP (by virtue of its consolidation of WES) may be required to recast their financial statements to include the activities of such assets as of the date of common control. See Note 2. For those periods requiring recast, the consolidated financial statements for periods prior to the acquisition of WES assets from Anadarko, including the Non-Operated Marcellus Interest, have been prepared from Anadarko's historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if WES had owned the assets during the periods reported. Net income attributable to WES assets for periods prior to WES's acquisition of such assets is not allocated to the limited partners for purposes of calculating net income per common unit.
Net income per common unit policy	Net income per common unit. Net income attributable to periods prior to WGP's IPO is attributable to subsidiaries of Anadarko and therefore not allocated to the limited partners for purposes of calculating net income per common unit. As a result, pre-IPO net income, representing the financial results prior to WGP's IPO on December 12, 2012, has been excluded from the limited partners' interest in net income.
Fair value policy	Anadarko-Operated Marcellus Interest acquisition. The Anadarko-Operated Marcellus Interest acquisition has been accounted for under the acquisition method of accounting. The assets acquired and liabilities assumed in the Anadarko-Operated Marcellus Interest acquisition were recorded in the consolidated balance sheet at their estimated fair values as of the acquisition date. Results of operations attributable to the Anadarko-Operated Marcellus Interest were included in the consolidated statements of income beginning on the acquisition date in the first quarter of 2013.

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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