Divestiture Transactions and Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013, 2012 and 2011:

	Year ended
	2013				2012				2011
Operating revenues	$	1,037			$	1,047			$	1,358
Operating expenses	(1,207		)	(a)	(3,474		)	(b)	(1,150		)
Operating income (loss)	(170		)		(2,427		)		208
Other income (loss)	(1		)		—				1
Interest charges	(39		)		(56		)		(64		)
Income (loss) before income taxes	(210		)		(2,483		)		145
Income tax (expense) benefit	(13		)		987				(56		)
Income (loss) from discontinued operations, net of taxes	$	(223	)		$	(1,496	)		$	89

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

(b) Includes a noncash pretax asset impairment charge of $628 million to reduce the carrying value of AERG’s Duck Creek energy center to its estimated fair value under held and used accounting guidance. In addition, includes a noncash pretax asset impairment charge of $1.95 billion to reduce the carrying values of all the AER coal and natural gas-fired energy centers, except the Joppa coal-fired energy center, to their estimated fair values, under held and used accounting guidance, as a result of the decision in December 2012 that Ameren intended to exit the Merchant Generation business.

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, 2013, and 2012:

	December 31, 2013		December 31, 2012
Assets of discontinued operations
Cash and cash equivalents	$	—	$	25
Accounts receivable and unbilled revenue	5		102
Materials and supplies	5		135
Mark-to-market derivative assets	—		102
Property and plant, net	142		748
Accumulated deferred income taxes, net(a)	13		395
Other assets	—		104
Total assets of discontinued operations	$	165	$	1,611
Liabilities of discontinued operations
Accounts payable and other current obligations	$	5	$	141
Mark-to-market derivative liabilities	—		63
Long-term debt, net	—		824
Asset retirement obligations(b)	40		97
Pension and other postretirement benefits	—		40
Other liabilities	—		28
Total liabilities of discontinued operations	$	45	$	1,193
Accumulated other comprehensive income (c)	$	—	$	19
Noncontrolling interest(d)	$	—	$	8

(a) The December 31, 2013 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 $31 million and $26 million at December 31, 2013, and 2012, respectively.

(c) Accumulated other comprehensive income related to discontinued operations included in “Accumulated other comprehensive loss” on Ameren’s December 31, 2012, consolidated balance sheet. This balance related to New AER assets and liabilities that were realized or removed from Ameren’s consolidated balance sheet either before or at the December 2, 2013 closing of the New AER divestiture.

(d) The 20% ownership interest of EEI not owned by Ameren was included in “Noncontrolling interests” on Ameren’s December 31, 2012, consolidated balance sheet. This noncontrolling interest was removed from Ameren’s consolidated balance sheet at the December 2, 2013 closing of the New AER divestiture.