Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2012

Discontinued Operations

Summarized results income statement, assets and liabilities of discontinued operations

The summarized results of operations included in income from discontinued operations were as follows (in millions):

	Years ended December 31,
	2012			2011			2010
Operating revenues	$	1,055		$	1,171		$	1,627
Operating and maintenance expense	(990		)	(871		)	(916		)
Depreciation and amortization expense	(183		)	(342		)	(580		)
Loss on impairment of assets in discontinued operations, net	(986		)	(38		)	(1,012		)
Gain on disposal of discontinued operations, net	82			183			2
Other income, net	—			18			8
Income (loss) from discontinued operations before income tax expense	(1,022		)	121			(871		)
Income tax expense	(5		)	(36		)	(23		)
Income (loss) from discontinued operations, net of tax	$	(1,027	)	$	85		$	(894	)

The carrying amounts of the major classes of assets and liabilities associated with our discontinued operations were classified as follows (in millions):

	December 31,
	2012		2011
Assets
Rigs and related equipment, net	$	104	$	—
Materials and supplies	71		—
Oil and gas properties, net	—		24
Other related assets	4		2
Assets held for sale	$	179	$	26
Materials and supplies	$	—	$	98
Other assets	—		21
Other current assets	$	—	$	119
Rig and related equipment, net	$	—	$	1,745
Intangible assets	—		70
Deferred costs	—		42
Other assets	$	—	$	1,857
Liabilities
Deferred revenues	$	32	$	17
Deferred income taxes, net	—		6
Other liabilities	3		14
Other current liabilities	$	35	$	37
Deferred revenues	$	—	$	8
Deferred taxes, net	—		32
Other long-term liabilities	$	—	$	40