Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Schedule Of Segment Reporting Information By Segment

The following table presents information about the revenues and specified items included in Ameren’s net income for the three months ended March 31, 2013, and 2012, and total assets as of March 31, 2013, and December 31, 2012.



Three Months	Ameren Missouri		Ameren Illinois		Other			Intersegment Eliminations			Consolidated
2013
External revenues	$	789	$	684	$	2		$	—		$	1,475
Intersegment revenues	7		—		2			(9		)	—
Net income (loss) attributable to Ameren Corporation from continuing operations	40		31		(17		)	—			54
2012
External revenues	$	686	$	724	$	2		$	—		$	1,412
Intersegment revenues	5		—		1			(6		)	—
Net income (loss) attributable to Ameren Corporation from continuing operations	21		27		(11		)	—			37
As of March 31, 2013:
Total assets	$	12,867	$	7,288	$	1,289		$	(992	)	$	20,452	^(a)
As of December 31, 2012:
Total assets	$	13,043	$	7,282	$	1,228		$	(944	)	$	20,609	^(a)

(a) Excludes “Current assets of discontinued operations.” See Note 2 - Divestiture Transactions and Discontinued Operations for additional information.

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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