Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Schedule Of Segment Reporting Information, By Segment

	Exploration and Production			Marketing, Gathering and Compression			Oilfield Services			Other Operations			Intercompany Eliminations			Consolidated Total
	($ in millions)
For the Three Months Ended March 31, 2012:
Revenues	$	1,068		$	2,392		$	447		$	—		$	(1,488	)	$	2,419
Intersegment revenues		—			(1,176	)		(312	)		—			1,488			—
Total revenues	$	1,068		$	1,216		$	135		$	—		$	—		$	2,419
Income (loss) before income taxes	$	86		$	66		$	40		$	(100	)	$	(97	)	$	(5	)
For the Three Months Ended March 31, 2011:
Revenues	$	494		$	2,221		$	248		$	—		$	(1,351	)	$	1,612
Intersegment revenues		—			(1,204	)		(147	)		—			1,351			—
Total revenues	$	494		$	1,017		$	101		$	—		$	—		$	1,612
Income (loss) before income taxes	$	(307	)	$	87		$	21		$	9		$	(76	)	$	(266	)
As of March 31, 2012:
Total Assets	$	39,060		$	4,264		$	1,869		$	2,431		$	(2,035	)	$	45,589
As of December 31, 2011:
Total Assets	$	35,403		$	4,047		$	1,571		$	2,718		$	(1,904	)	$	41,835