Segment Information

12 Months Ended

Dec. 31, 2015

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 common shareholders and capital expenditures from continuing operations for the years ended December 31, 2015, 2014, and 2013, and total assets in continuing operations as of December 31, 2015, 2014, and 2013:

	Ameren Missouri		Ameren Illinois		Other				Intersegment Eliminations			Consolidated
2015
External revenues	$	3,566	$	2,462	$	70			$	—		$	6,098
Intersegment revenues	43		4		2				(49		)	—
Depreciation and amortization	492		295		9				—			796
Interest and dividend income	28		12		1				—			41
Interest charges	219		131		5				—			355
Income taxes	209		127		27				—			363
Net income attributable to Ameren common shareholders from continuing operations	352		214		13				—			579
Capital expenditures	622		918		377			(a)	—			1,917
Total assets(c)	13,851		8,903		1,139				(267		)	23,626		(b)
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 common shareholders from continuing operations	390		201		(4		)		—			587
Capital expenditures	747		835		203			(a)	—			1,785
Total assets(c)	13,474		8,204		799				(203		)	22,274		(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 common shareholders from continuing operations	395		160		(43		)		—			512
Capital expenditures	648		701		30			(a)	—			1,379
Total assets(c)	12,867		7,397		711				(233		)	20,742		(b)

(a) Includes the elimination of intercompany transfers.

(b) Excludes total assets from discontinued operations of $14 million, $15 million, and $165 million as of December 31, 2015, 2014, and 2013, respectively.

(c) Reflects the adoption of the new authoritative accounting guidance for the presentation of debt issuance costs and balance sheet classification of deferred income taxes. See Note 1 – Summary of Significant Accounting Policies for additional information.