Divestiture Transactions and Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2014

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

The following table presents the components of discontinued operations in Ameren's consolidated statement of income (loss) for the years ended December 31, 2014, 2013, and 2012:

	Year ended
	2014			2013				2012
Operating revenues	$	1		$	1,037			$	1,047
Operating expenses	(2		)	(1,207		)	(a)	(3,474		)	(b)
Operating income (loss)	(1		)	(170		)		(2,427		)
Other income (loss)	—			(1		)		—
Interest charges	—			(39		)		(56		)
Income (loss) before income taxes	(1		)	(210		)		(2,483		)
Income tax (expense) benefit	—			(13		)		987
Income (loss) from discontinued operations, net of taxes	$	(1	)	$	(223	)		$	(1,496	)

(a) Includes a $201 million pretax loss on disposal relating to the New AER divestiture.

(b) Includes a noncash pretax asset impairment charge of $2.58 billion to reduce the carrying value of AER's energy centers to their estimated fair value under held and used accounting guidance.

The following table presents the carrying amounts of the components of assets and liabilities segregated on Ameren's consolidated balance sheets as discontinued operations at December 31, 2014 and 2013:

	December 31, 2014		December 31, 2013
Assets of discontinued operations
Accounts receivable and unbilled revenue	$	—	$	5
Materials and supplies	—		5
Property and plant, net	—		142
Accumulated deferred income taxes, net(a)	15		13
Total assets of discontinued operations	$	15	$	165
Liabilities of discontinued operations
Accounts payable and other current obligations	$	1	$	5
Asset retirement obligations(b)	32		40
Total liabilities of discontinued operations	$	33	$	45

(a) The December 31, 2014 balance primarily consists of deferred income tax assets related to the abandoned Meredosia and Hutsonville energy centers.

(b) Includes AROs associated with the abandoned Meredosia and Hutsonville energy centers of $32 million and $31 million at December 31, 2014 and 2013, respectively.