Acquisitions, Divestitures, and Assets Held for Sale - Acquisitions Table (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Purchase price	$ 473		$ 0	$ 802
Moxa Oil and Gas Properties [Member]
Business Acquisition [Line Items]
Ownership interest purchased	100.00%
Purchase price	310	[1]
Fair value, oil and gas properties acquired	306
Marcellus Interest in Gas Gathering Systems [Member]
Business Acquisition [Line Items]
Ownership interest purchased	33.75%
Purchase price	135
Mont Belvieu Joint Venture [Member]
Business Acquisition [Line Items]
Ownership interest purchased	25.00%
Purchase price	78
Intrastate Pipeline in Wyoming [Member]
Business Acquisition [Line Items]
Ownership interest purchased	100.00%
Purchase price	28
Natural-Gas Processing Plant and Related Gathering Systems [Member]
Business Acquisition [Line Items]
Ownership interest purchased				100.00%
Purchase price				302
Wattenberg Natural Gas Processing Plant [Member]
Business Acquisition [Line Items]
Ownership interest purchased				93.00%
Purchase price				500	[2]
Loss on Anadarko's preexisting contracts with the previous Wattenberg Plant owner				$ 76
Ownership interest				100.00%

[1] Includes $306 million that represents the fair value of the oil and gas properties acquired.

[2] The Company recognized a $76 million loss on preexisting contracts with the previous Wattenberg Plant owner in addition to the cash paid in the Wattenberg Plant acquisition. Anadarko operates and owns a 100% interest in the Wattenberg Plant.