Noncontrolling Interests	3 Months Ended
Noncontrolling Interests	Mar. 31, 2014
Disclosure Text Block [Abstract]
Noncontrolling Interests	5. Noncontrolling Interests Western Gas Equity Partners, LP (WGP) is a publicly traded consolidated subsidiary formed to own substantially all of the partnership interests in Western Gas Partners, LP (WES) previously owned by Anadarko. At March 31, 2014, Anadarko’s ownership interest in WGP consisted of a 91.0% limited partner interest and the entire non-economic general partner interest. The remaining limited partner interest in WGP consisted of a 9.0% public ownership interest. WES, a publicly traded consolidated subsidiary, is a limited partnership formed by Anadarko to own, operate, acquire, and develop midstream assets. During the three months ended March 31, 2014, WES issued 300,000 common units to the public pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with WES’s December 2013 equity offering, raising additional net proceeds of $18 million. At March 31, 2014, WGP’s ownership interest in WES consisted of a 41.0% limited partner interest, the entire 2.0% general partner interest, and all WES incentive distribution rights. At March 31, 2014, Anadarko also owned a 0.6% limited partner interest in WES through other subsidiaries. The remaining limited partner interest in WES consisted of a 56.4% public ownership interest.

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

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