Discontinued Operations (Tables)

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

	Years ended December 31,
	2013			2012			2011
Operating revenues	$	796		$	1,055		$	1,171
Operating and maintenance expense	(800		)	(990		)	(871		)
Depreciation and amortization expense	—			(183		)	(342		)
Loss on impairment of assets in discontinued operations	(14		)	(986		)	(38		)
Gain on disposal of assets in discontinued operations, net	54			82			183
Other income, net	5			—			18
Income (loss) from discontinued operations before income tax expense	41			(1,022		)	121
Income tax expense	(40		)	(5		)	(36		)
Income (loss) from discontinued operations, net of tax	$	1		$	(1,027	)	$	85

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

	December 31,
	2013		2012
Assets
Rigs and related equipment, net	$	—	$	104
Materials and supplies, net	18		71
Other related assets	1		4
Assets held for sale	$	19	$	179

Liabilities
Deferred revenues	$	8	$	32
Other liabilities	—		3
Other current liabilities	$	8	$	35

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

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