Segment Information

12 Months Ended

Dec. 31, 2014

Segment Reporting Information, Profit (Loss) [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

Ameren has two reportable segments: Ameren Missouri and Ameren Illinois. Ameren Missouri and Ameren Illinois each have one reportable segment. The Ameren Missouri segment for both Ameren and Ameren Missouri includes all the operations of Ameren Missouri as described in Note 1 – Summary of Significant Accounting Policies. The Ameren Illinois segment for both Ameren and Ameren Illinois consists of all of the operations of Ameren Illinois as described in Note 1 – Summary of Significant Accounting Policies. The category called Other primarily includes Ameren parent company activities, Ameren Services, and ATXI. The Other category also includes certain corporate activities previously included in the Merchant Generation segment. See Note 16 – Divestiture Transactions and Discontinued Operations for additional information.

The following table presents information about the reported revenues and specified items reflected in Ameren’s net income attributable to Ameren Corporation and capital expenditures from continuing operations for the years ended December 31, 2014, 2013, and 2012, and total assets in continuing operations as of December 31, 2014, 2013, and 2012:

	Ameren Missouri		Ameren Illinois		Other				Intersegment Eliminations			Consolidated
2014
External revenues	$	3,526	$	2,496	$	31			$	—		$	6,053
Intersegment revenues	27		2		2				(31		)	—
Depreciation and amortization	473		263		9				—			745
Interest and dividend income	28		7		2				—			37
Interest charges	211		112		18				—			341
Income taxes	229		143		5				—			377
Net income (loss) attributable to Ameren Corporation from continuing operations	390		201		(4		)		—			587
Capital expenditures	747		835		203			(a)	—			1,785
Total assets	13,541		8,381		942				(203		)	22,661		(b)
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)

.

(a) Includes the elimination of intercompany transfers.

(b) Excludes total assets from discontinued operations of $15 million, $165 million, and $1,611 million as of December 31, 2014, 2013, and 2012, respectively.