Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Schedule Of Segment Reporting Information By Segment

The following tables present revenues, net income attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three and six months ended June 30, 2018 and 2017. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount.

Ameren



Three Months	Ameren Missouri		Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas		Ameren Transmission			Other			Intersegment Eliminations			Consolidated
2018
External revenues	$	946	$	386	$	142	$	89		$	—		$	—		$	1,563
Intersegment revenues	9		1		—		14			—			(24		)	—
Net income attributable to Ameren common shareholders	168		33		7		36		^(a)	(5		)	—			239
Capital expenditures	205		132		66		130			(2		)	2			533
2017
External revenues	$	922	$	387	$	134	$	92		$	2		$	—		$	1,537
Intersegment revenues	12		2		—		13			—			(27		)	—
Net income attributable to Ameren common shareholders	120		33		5		34		^(a)	1			—			193
Capital expenditures	159		122		58		156			1			(2		)	494
Six Months
2018
External revenues	$	1,730	$	785	$	453	$	180		$	—		$	—		$	3,148
Intersegment revenues	17		2		—		27			—			(46		)	—
Net income attributable to Ameren common shareholders	206		66		49		73		^(a)	(4		)	—			390
Capital expenditures	454		254		126		275			5			(2		)	1,112
2017
External revenues	$	1,695	$	771	$	398	$	188		$	—		$	—		$	3,052
Intersegment revenues	30		3		—		19			—			(52		)	—
Net income attributable to Ameren common shareholders	125		63		38		68		^(a)	1			—			295
Capital expenditures	355		242		109		290			5			(3		)	998


(a)	Ameren Transmission earnings include an allocation of financing costs from Ameren (parent).

Ameren Illinois



Three Months	Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas		Ameren Illinois Transmission		Intersegment Eliminations			Total Ameren Illinois
2018
External revenues	$	387	$	142	$	49	$	—		$	578
Intersegment revenues	—		—		13		(13		)	—
Net income available to common shareholder	33		7		22		—			62
Capital expenditures	132		66		104		—			302
2017
External revenues	$	389	$	134	$	53	$	—		$	576
Intersegment revenues	—		—		12		(12		)	—
Net income available to common shareholder	33		5		19		—			57
Capital expenditures	122		58		77		—			257
Six Months
2018
External revenues	$	787	$	453	$	98	$	—		$	1,338
Intersegment revenues	—		—		26		(26		)	—
Net income available to common shareholder	66		49		42		—			157
Capital expenditures	254		126		222		—			602
2017
External revenues	$	774	$	398	$	107	$	—		$	1,279
Intersegment revenues	—		—		18		(18		)	—
Net income available to common shareholder	63		38		35		—			136
Capital expenditures	242		109		133		—			484

Disaggregation of Revenue

The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and six months ended June 30, 2018 and 2017. Economic factors affect the nature, timing, amount, and uncertainty of revenues and cash flows in a similar manner across customer classes. Revenues from alternative revenue programs have a similar distribution among customer classes as revenues from contracts with customers. Other revenues not associated with contracts with customers are presented in the Other customer classification, along with electric transmission and off-system revenues.

Ameren



Three Months	Ameren Missouri				Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas		Ameren Transmission		Other		Intersegment Eliminations			Consolidated
2018
Residential	$	432			$	221	$	—	$	—	$	—	$	—		$	653
Commercial	364				126		—		—		—		—			490
Industrial	87				33		—		—		—		—			120
Other	47			^(a)	7		—		103		—		(24		)	133		^(a)
Total electric revenues	$	930			$	387	$	—	$	103	$	—	$	(24	)	$	1,396
Residential	$	13			$	—	$	97	$	—	$	—	$	—		$	110
Commercial	6				—		26		—		—		—			32
Industrial	—				—		5		—		—		—			5
Other	6				—		14		—		—		—			20
Total gas revenues	25				—		142		—		—		—			167
Total revenues^(b)	$	955			$	387	$	142	$	103	$	—	$	(24	)	$	1,563
2017
Residential	$	358			$	208	$	—	$	—	$	—	$	—		$	566
Commercial	332				129		—		—		—		—			461
Industrial	84				28		—		—		—		—			112
Other	138				24		—		105		2		(26		)	243
Total electric revenues	$	912			$	389	$	—	$	105	$	2	$	(26	)	$	1,382
Residential	$	10			$	—	$	84	$	—	$	—	$	—		$	94
Commercial	4				—		24		—		—		—			28
Industrial	1				—		2		—		—		—			3
Other	7				—		24		—		—		(1		)	30
Total gas revenues	$	22			$	—	$	134	$	—	$	—	$	(1	)	$	155
Total revenues^(b)	$	934			$	389	$	134	$	105	$	2	$	(27	)	$	1,537
Six Months
2018
Residential	$	764			$	440	$	—	$	—	$	—	$	—		$	1,204
Commercial	616				250		—		—		—		—			866
Industrial	148				68		—		—		—		—			216
Other	143			^(a)	29		—		207		—		(46		)	333		^(a)
Total electric revenues	$	1,671			$	787	$	—	$	207	$	—	$	(46	)	$	2,619
Residential	$	54			$	—	$	340	$	—	$	—	$	—		$	394
Commercial	22				—		93		—		—		—			115
Industrial	2				—		11		—		—		—			13
Other	(2		)		—		9		—		—		—			7
Total gas revenues	$	76			$	—	$	453	$	—	$	—	$	—		$	529
Total revenues^(b)	$	1,747			$	787	$	453	$	207	$	—	$	(46	)	$	3,148
2017
Residential	$	644			$	427	$	—	$	—	$	—	$	—		$	1,071
Commercial	562				262		—		—		—		—			824
Industrial	142				56		—		—		—		—			198
Other	311				29		—		207		—		(51		)	496
Total electric revenues	$	1,659			$	774	$	—	$	207	$	—	$	(51	)	$	2,589
Residential	$	40			$	—	$	287	$	—	$	—	$	—		$	327
Commercial	16				—		79		—		—		—			95
Industrial	2				—		5		—		—		—			7
Other	8				—		27		—		—		(1		)	34
Total gas revenues	$	66			$	—	$	398	$	—	$	—	$	(1	)	$	463
Total revenues^(b)	$	1,725			$	774	$	398	$	207	$	—	$	(52	)	$	3,052


(a)	Includes $37 million and $47 million for the three and six months ended June 30, 2018, respectively, for the reduction to revenue for the excess amounts collected in rates related to the TCJA from January 1, 2018, through June 30, 2018. See Note 2 – Rate and Regulatory Matters for additional information.


(b)	The following table presents revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2018 and 2017:



Three Months	Ameren Missouri			Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas			Ameren Transmission			Consolidated
2018
Revenues from alternative revenue programs	$	(5	)	$	15	$	(5	)	$	(5	)	$	—
Other revenues not from contracts with customers	5			3		—			—			8
2017
Revenues from alternative revenue programs	$	(7	)	$	16	$	1		$	2		$	12
Other revenues not from contracts with customers	3			1		1			—			5
Six Months
2018
Revenues from alternative revenue programs	$	(9	)	$	46	$	(8	)	$	(9	)	$	20
Other revenues not from contracts with customers	19			13		1			—			33
2017
Revenues from alternative revenue programs	$	(14	)	$	49	$	12		$	7		$	54
Other revenues not from contracts with customers	7			3		2			—			12

Ameren Illinois



Three Months	Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas		Ameren Illinois Transmission		Intersegment Eliminations			Total Ameren Illinois
2018
Residential	$	221	$	97	$	—	$	—		$	318
Commercial	126		26		—		—			152
Industrial	33		5		—		—			38
Other	7		14		62		(13		)	70
Total revenues^(a)	$	387	$	142	$	62	$	(13	)	$	578
2017
Residential	$	208	$	84	$	—	$	—		$	292
Commercial	129		24		—		—			153
Industrial	28		2		—		—			30
Other	24		24		65		(12		)	101
Total revenues^(a)	$	389	$	134	$	65	$	(12	)	$	576
Six Months
2018
Residential	$	440	$	340	$	—	$	—		$	780
Commercial	250		93		—		—			343
Industrial	68		11		—		—			79
Other	29		9		124		(26		)	136
Total revenues^(a)	$	787	$	453	$	124	$	(26	)	$	1,338
2017
Residential	$	427	$	287	$	—	$	—		$	714
Commercial	262		79		—		—			341
Industrial	56		5		—		—			61
Other	29		27		125		(18		)	163
Total revenues^(a)	$	774	$	398	$	125	$	(18	)	$	1,279


(a)	The following table presents revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and six months ended June 30, 2018 and 2017:



Three Months	Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas			Ameren Illinois Transmission			Consolidated
2018
Revenues from alternative revenue programs	$	15	$	(5	)	$	(5	)	$	5
Other revenues not from contracts with customers	3		—			—			3
2017
Revenues from alternative revenue programs	$	16	$	1		$	2		$	19
Other revenues not from contracts with customers	1		1			—			2
Six Months
2018
Revenues from alternative revenue programs	$	46	$	(8	)	$	(9	)	$	29
Other revenues not from contracts with customers	13		1			—			14
2017
Revenues from alternative revenue programs	$	49	$	12		$	5		$	66
Other revenues not from contracts with customers	3		2			—			5