Divestiture Transactions and Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2015

Discontinued Operations and Disposal Groups [Abstract]

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, 2015, 2014, and 2013:

	Year ended
	2015		2014			2013
Operating revenues	$	—	$	1		$	1,037
Operating benefits (expenses)	1		(2		)	(1,207		)	(a)
Operating income (loss)	1		(1		)	(170		)
Other income (loss)	—		—			(1		)
Interest charges	—		—			(39		)
Income (loss) before income taxes	1		(1		)	(210		)
Income tax (expense) benefit	50		—			(13		)
Income (loss) from discontinued operations, net of taxes	$	51	$	(1	)	$	(223	)

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

The following table presents the carrying amounts of the components of assets and liabilities of Ameren's discontinued operations, which consist primarily of AROs and related deferred income tax assets associated with the abandoned Meredosia and Hutsonville energy centers, at December 31, 2015 and 2014:

	December 31, 2015		December 31, 2014
Assets of discontinued operations
Accumulated deferred income taxes, net	$	14	$	15
Total assets of discontinued operations	$	14	$	15
Liabilities of discontinued operations
Accounts payable and other current obligations	$	1	$	1
Asset retirement obligations(a)	28		32
Total liabilities of discontinued operations	$	29	$	33

(a) Ameren is demolishing the Hutsonville energy center and expects to demolish the Meredosia energy center beginning in 2016.