Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Table Text Block [Abstract]

Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) before Income Taxes

	Three Months Ended
	March 31,
millions	2013		2012
Income (loss) before income taxes	$	940	$	2,535
Exploration expense		264		244
DD&A		1,022		930
Impairments		29		50
Deepwater Horizon settlement and related costs		3		8
Algeria exceptional profits tax settlement		33		(1,804)
Tronox-related contingent loss		—		275
Interest expense		164		186
Unrealized (gains) losses on derivatives, net		246		(142)
Less net income attributable to noncontrolling interests		24		27
Consolidated Adjusted EBITDAX	$	2,677	$	2,255

Schedule of Segment Reporting Information, by Segment

		Oil and Gas						Other and
		Exploration						Intersegment
millions		& Production		Midstream		Marketing		Eliminations		Total
Three Months Ended March 31, 2013
Sales revenues		$	1,541	$	84	$	2,093	$	—	$	3,718
Intersegment revenues			1,862		253		(1,966)		(149)		—
Gains (losses) on divestitures and other, net			4		—		—		171		175
	Total revenues and other		3,407		337		127		22		3,893
Operating costs and expenses (1)			881		188		164		20		1,253
Realized (gains) losses on commodity
	derivatives, net		—		—		—		(51)		(51)
Other (income) expense, net (2)			—		—		—		(6)		(6)
Net income attributable to
	noncontrolling interests		—		24		—		—		24
	Total expenses and other		881		212		164		(37)		1,220
Unrealized (gains) losses on derivatives, net
	included in marketing revenue		—		—		4		—		4
Adjusted EBITDAX		$	2,526	$	125	$	(33)	$	59	$	2,677
Three Months Ended March 31, 2012
Sales revenues		$	1,899	$	87	$	1,426	$	—	$	3,412
Intersegment revenues			1,174		249		(1,295)		(128)		—
Gains (losses) on divestitures and other, net			(17)		(1)		—		53		35
	Total revenues and other		3,056		335		131		(75)		3,447
Operating costs and expenses (1)			926		189		154		48		1,317
Realized (gains) losses on commodity
	derivatives, net		—		—		—		(137)		(137)
Other (income) expense, net (2)			—		—		—		(10)		(10)
Net income attributable to
	noncontrolling interests		—		27		—		—		27
	Total expenses and other		926		216		154		(99)		1,197
Unrealized (gains) losses on derivatives, net
	included in marketing revenue		—		—		5		—		5
Adjusted EBITDAX		$	2,130	$	119	$	(18)	$	24	$	2,255

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(1) Operating costs and expenses excludes 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.