Segment Information - Selected Financial Information for Anadarko's Reporting Segments Table (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 14,867,000,000		$ 13,307,000,000		$ 13,882,000,000
Gains (losses) on divestitures and other, net	(286,000,000)		104,000,000		85,000,000
Total revenues and other	14,581,000,000		13,411,000,000		13,967,000,000
Operating costs and expenses (1)	5,150,000,000	[1]	5,164,000,000	[1]	5,227,000,000	[1]
Net cash received in settlement of commodity derivatives	(85,000,000)		(685,000,000)		(147,000,000)
Other (income) expense, net	89,000,000		(4,000,000)		4,000,000
Net income attributable to noncontrolling interests	140,000,000		54,000,000		81,000,000
Total expenses and other	5,174,000,000		4,461,000,000		5,086,000,000
Adjusted EBITDAX	9,403,000,000		8,966,000,000		8,869,000,000
Net properties and equipment	40,929,000,000		38,398,000,000		37,501,000,000
Capital expenditures	8,523,000,000		7,311,000,000		6,553,000,000
Goodwill	5,492,000,000		5,492,000,000		5,641,000,000
(Gains) Losses on Derivatives, net [Member] | Commodity Contract [Member]
Segment Reporting Information [Line Items]
Net cash received in settlement of commodity derivatives	(95,000,000)		(753,000,000)		(226,000,000)
Gathering, Processing, and Marketing Sales [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Segment Reporting Information [Line Items]
Total (gains) losses on derivatives, net included in marketing revenue, less net cash received in settlement	(4,000,000)		16,000,000		(12,000,000)
Excluding Certain Other Nonoperating Items [Member]
Segment Reporting Information [Line Items]
Other (income) expense, net	(21,000,000)	[2]	(4,000,000)	[2]	4,000,000	[2]
Other and Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0		0		(2,000,000)
Gains (losses) on divestitures and other, net	337,000,000		177,000,000		139,000,000
Total revenues and other	(314,000,000)		(366,000,000)		(310,000,000)
Operating costs and expenses (1)	20,000,000	[1]	295,000,000	[1]	186,000,000	[1]
Total expenses and other	(96,000,000)		(462,000,000)		(36,000,000)
Adjusted EBITDAX	(218,000,000)		96,000,000		(274,000,000)
Net properties and equipment	2,103,000,000		1,906,000,000		1,825,000,000
Capital expenditures	267,000,000		155,000,000		107,000,000
Goodwill	0		0		0
Other and Intersegment Eliminations [Member] | (Gains) Losses on Derivatives, net [Member] | Commodity Contract [Member]
Segment Reporting Information [Line Items]
Net cash received in settlement of commodity derivatives	(95,000,000)		(753,000,000)		(226,000,000)
Other and Intersegment Eliminations [Member] | Excluding Certain Other Nonoperating Items [Member]
Segment Reporting Information [Line Items]
Other (income) expense, net	(21,000,000)	[2]	(4,000,000)	[2]	4,000,000	[2]
Other and Intersegment Eliminations [Member] | Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Revenues	(651,000,000)		(543,000,000)		(447,000,000)
Oil and Gas Exploration and Production Reporting Segment [Member]
Segment Reporting Information [Line Items]
Revenues	7,090,000,000		6,752,000,000		7,519,000,000
Gains (losses) on divestitures and other, net	(622,000,000)		(65,000,000)		(41,000,000)
Oil and Gas Exploration and Production Reporting Segment [Member] | Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Revenues	6,405,000,000		5,318,000,000		5,005,000,000
Oil and Gas Exploration and Production Reporting Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues and other	12,873,000,000		12,005,000,000		12,483,000,000
Operating costs and expenses (1)	3,635,000,000	[1]	3,505,000,000	[1]	3,696,000,000	[1]
Total expenses and other	3,635,000,000		3,505,000,000		3,696,000,000
Adjusted EBITDAX	9,238,000,000		8,500,000,000		8,787,000,000
Net properties and equipment	33,409,000,000		32,024,000,000		32,235,000,000
Capital expenditures	7,008,000,000		5,906,000,000		5,026,000,000
Goodwill	5,317,000,000		5,317,000,000		5,475,000,000
Midstream Reporting Segment [Member]
Segment Reporting Information [Line Items]
Revenues	387,000,000		325,000,000		342,000,000
Gains (losses) on divestitures and other, net	(1,000,000)		(8,000,000)		(13,000,000)
Midstream Reporting Segment [Member] | Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Revenues	1,105,000,000		959,000,000		957,000,000
Midstream Reporting Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues and other	1,491,000,000		1,276,000,000		1,286,000,000
Operating costs and expenses (1)	843,000,000	[1]	748,000,000	[1]	786,000,000	[1]
Net income attributable to noncontrolling interests	140,000,000		54,000,000		81,000,000
Total expenses and other	983,000,000		802,000,000		867,000,000
Adjusted EBITDAX	508,000,000		474,000,000		419,000,000
Net properties and equipment	5,408,000,000		4,459,000,000		3,432,000,000
Capital expenditures	1,248,000,000		1,250,000,000		1,420,000,000
Goodwill	175,000,000		175,000,000		166,000,000
Marketing Reporting Segment [Member]
Segment Reporting Information [Line Items]
Revenues	7,390,000,000		6,230,000,000		6,023,000,000
Gains (losses) on divestitures and other, net	0		0		0
Marketing Reporting Segment [Member] | Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Revenues	(6,859,000,000)		(5,734,000,000)		(5,515,000,000)
Marketing Reporting Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues and other	531,000,000		496,000,000		508,000,000
Operating costs and expenses (1)	652,000,000	[1]	616,000,000	[1]	559,000,000	[1]
Total expenses and other	652,000,000		616,000,000		559,000,000
Adjusted EBITDAX	(125,000,000)		(104,000,000)		(63,000,000)
Net properties and equipment	9,000,000		9,000,000		9,000,000
Capital expenditures	0		0		0
Goodwill	0		0		0
Marketing Reporting Segment [Member] | Operating Segments [Member] | Gathering, Processing, and Marketing Sales [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Segment Reporting Information [Line Items]
Total (gains) losses on derivatives, net included in marketing revenue, less net cash received in settlement	$ (4,000,000)		$ 16,000,000		$ (12,000,000)

[1] Operating costs and expenses exclude exploration expense, DD&A, impairments, Deepwater Horizon settlement and related costs, and Algeria exceptional profits tax settlement since these expenses are excluded from Adjusted EBITDAX.

[2] Other (income) expense, net excludes Tronox-related contingent loss since this expense is excluded from Adjusted EBITDAX.