Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended March 31, 2016
										Not Allocated
(In millions)	N.A. E&P			Int'l E&P			OSM			to Segments				Total
Sales and other operating revenues	$	493		$	96		$	148		$	(23	)	(c)	$	714
Marketing revenues	31			15			12			—				58
Total revenues	524			111			160			(23		)		772
Income from equity method investments	—			14			—			—				14
Net gain (loss) on disposal of assets and other income	1			6			—			(63		)	(d)	(56		)
Less:
Production expenses	134			53			141			—				328
Marketing costs	32			14			12			—				58
Exploration expenses	18			6			—			—				24
Depreciation, depletion and amortization	487			50			60			12				609
Impairments	1			—			—			—				1
Other expenses (a)	118			16			7			119			(e)	260
Taxes other than income	42			—			5			1				48
Net interest and other	—			—			—			85				85
Income tax benefit	(112		)	(12		)	(17		)	(135		)		(276		)
Segment income (loss) / Net income (loss)	$	(195	)	$	4		$	(48	)	$	(168	)		$	(407	)
Capital expenditures (b)	$	315		$	32		$	9		$	3			$	359

^(a)  Includes other operating expenses and general and administrative expenses.

(b)Includes accruals.

^(c)  Unrealized loss on commodity derivative instruments.

^(d)  Related to the net loss on disposal of assets (see Note 5).

^(e)  Includes pension settlement loss of $48 million and severance related expenses associated with workforce reductions of $7 million (see Note 7).

	Three Months Ended March 31, 2015
										Not Allocated
(In millions)	N.A. E&P			Int'l E&P			OSM			to Segments				Total
Sales and other operating revenues	$	850		$	182		$	225		$	23		(c)	$	1,280
Marketing revenues	178			26			—			—				204
Total revenues	1,028			208			225			23				1,484
Income from equity method investments	—			36			—			—				36
Net gain on disposal of assets and other income	—			10			1			1				12
Less:
Production expenses	202			67			175			—				444
Marketing costs	180			25			—			—				205
Exploration expenses	35			55			—			—				90
Depreciation, depletion and amortization	683			64			62			12				821
Other expenses (a)	117			23			9			129			(d)	278
Taxes other than income	61			—			5			1				67
Net interest and other	—			—			—			47				47
Income tax benefit	(89		)	(3		)	(6		)	(46		)		(144		)
Segment income (loss) / Net income (loss)	$	(161	)	$	23		$	(19	)	$	(119	)		$	(276	)
Capital expenditures (b)	$	933		$	146		$	21		$	2			$	1,102

^(a)  Includes other operating expenses and general and administrative expenses.

^(b)  Includes accruals.

^(c)  Unrealized gain on commodity derivative instruments.

^(d)  Includes $43 million of severance related expenses associated with a workforce reduction and pension settlement loss of $17 million (see Note 7).