Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting Information, Profit (Loss) [Abstract]

Schedule Of Segment Reporting Information, By Segment

The following table presents information about the reported revenues and specified items reflected in Ameren’s net income attributable to Ameren Corporation from continuing operations for the years ended December 31, 2013, 2012, and 2011, and total assets in continuing operations as of December 31, 2013, 2012, and 2011.

Ameren

	Ameren Missouri		Ameren Illinois		Other				Intersegment Eliminations			Consolidated
2013
External revenues	$	3,516	$	2,307	$	15			$	—		$	5,838
Intersegment revenues	25		4		2				(31		)	—
Depreciation and amortization	454		243		9				—			706
Interest and dividend income	27		2		1				—			30
Interest charges	210		143		45				—			398
Income taxes (benefit)	242		110		(41		)		—			311
Net income (loss) attributable to Ameren Corporation from continuing operations	395		160		(43		)		—			512
Capital expenditures	648		701		30			(a)	—			1,379
Total assets	12,904		7,454		752				(233		)	20,877		(b)
2012
External revenues	$	3,252	$	2,524	$	5			$	—		$	5,781
Intersegment revenues	20		1		3				(24		)	—
Depreciation and amortization	440		221		12				—			673
Interest and dividend income	32		—		—				—			32
Interest charges	223		129		40				—			392
Income taxes (benefit)	252		94		(39		)		—			307
Net income (loss) attributable to Ameren Corporation from continuing operations	416		141		(41		)		—			516
Capital expenditures	595		442		26			(a)	—			1,063
Total assets	13,043		7,282		1,228				(934		)	20,619		(b)
2011
External revenues	$	3,360	$	2,784	$	4			$	—		$	6,148
Intersegment revenues	23		3		3				(29		)	—
Depreciation and amortization	408		215		20				—			643
Interest and dividend income	30		1		—				—			31
Interest charges	209		136		42				—			387
Income taxes (benefit)	161		127		(34		)		—			254
Net income (loss) attributable to Ameren Corporation from continuing operations	287		193		(49		)		—			431
Capital expenditures	550		351		(20		)	(a)	—			881
Total assets	12,757		7,213		1,211				(1,179		)	20,002		(b)

.

(a) Includes the elimination of intercompany transfers.