Segment Information (Tables)

9 Months Ended

Sep. 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 nine months ended September 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	$	1,118	$	392	$	116	$	98		$	—		$	—		$	1,724
Intersegment revenues	11		—		—		15			—			(26		)	—
Net income attributable to Ameren common shareholders	294		35		—		48		^(a)	(20		)	—			357
Capital expenditures	210		135		111		124			1			(4		)	577
2017
External revenues	$	1,105	$	404	$	111	$	105		$	(2	)	$	—		$	1,723
Intersegment revenues	11		—		1		14			—			(26		)	—
Net income attributable to Ameren common shareholders	234		31		2		38		^(a)	(17		)	—			288
Capital expenditures	178		112		71		173			(2		)	(7		)	525
Nine Months
2018
External revenues	$	2,848	$	1,177	$	569	$	278		$	—		$	—		$	4,872
Intersegment revenues	28		2		—		42			—			(72		)	—
Net income attributable to Ameren common shareholders	500		101		49		121		^(a)	(24		)	—			747
Capital expenditures	664		389		237		399			6			(6		)	1,689
2017
External revenues	$	2,800	$	1,175	$	509	$	293		$	(2	)	$	—		$	4,775
Intersegment revenues	41		3		1		33			—			(78		)	—
Net income attributable to Ameren common shareholders	359		94		40		106		^(a)	(16		)	—			583
Capital expenditures	533		354		180		463			3			(10		)	1,523


(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	$	392	$	116	$	56	$	—		$	564
Intersegment revenues	—		—		15		(15		)	—
Net income available to common shareholder	35		—		28		—			63
Capital expenditures	135		111		99		—			345
2017
External revenues	$	404	$	112	$	58	$	—		$	574
Intersegment revenues	—		—		14		(14		)	—
Net income available to common shareholder	31		2		22		—			55
Capital expenditures	112		71		93		—			276
Nine Months
2018
External revenues	$	1,179	$	569	$	154	$	—		$	1,902
Intersegment revenues	—		—		41		(41		)	—
Net income available to common shareholder	101		49		70		—			220
Capital expenditures	389		237		321		—			947
2017
External revenues	$	1,178	$	510	$	165	$	—		$	1,853
Intersegment revenues	—		—		32		(32		)	—
Net income available to common shareholder	94		40		57		—			191
Capital expenditures	354		180		226		—			760

Disaggregation of Revenue

The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 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	$	508		$	223	$	—	$	—	$	—		$	—		$	731
Commercial	417			131		—		—		—			—			548
Industrial	101			28		—		—		—			—			129
Other	85		^(a)	10		—		113		—			(26		)	182		^(a)
Total electric revenues	$	1,111		$	392	$	—	$	113	$	—		$	(26	)	$	1,590
Residential	$	8		$	—	$	68	$	—	$	—		$	—		$	76
Commercial	3			—		20		—		—			—			23
Industrial	1			—		1		—		—			—			2
Other	6			—		27		—		—			—			33
Total gas revenues	$	18		$	—	$	116	$	—	$	—		$	—		$	134
Total revenues^(b)	$	1,129		$	392	$	116	$	113	$	—		$	(26	)	$	1,724
2017
Residential	$	491		$	224	$	—	$	—	$	—		$	—		$	715
Commercial	409			133		—		—		—			—			542
Industrial	100			27		—		—		—			—			127
Other	99			20		—		119		(2		)	(26		)	210
Total electric revenues	$	1,099		$	404	$	—	$	119	$	(2	)	$	(26	)	$	1,594
Residential	$	9		$	—	$	72	$	—	$	—		$	—		$	81
Commercial	4			—		21		—		—			—			25
Industrial	1			—		2		—		—			—			3
Other	3			—		17		—		—			—			20
Total gas revenues	$	17		$	—	$	112	$	—	$	—		$	—		$	129
Total revenues^(b)	$	1,116		$	404	$	112	$	119	$	(2	)	$	(26	)	$	1,723
Nine Months
2018
Residential	$	1,272		$	663	$	—	$	—	$	—		$	—		$	1,935
Commercial	1,033			381		—		—		—			—			1,414
Industrial	249			96		—		—		—			—			345
Other	228		^(a)	39		—		320		—			(72		)	515		^(a)
Total electric revenues	$	2,782		$	1,179	$	—	$	320	$	—		$	(72	)	$	4,209
Residential	$	62		$	—	$	408	$	—	$	—		$	—		$	470
Commercial	25			—		113		—		—			—			138
Industrial	3			—		12		—		—			—			15
Other	4			—		36		—		—			—			40
Total gas revenues	$	94		$	—	$	569	$	—	$	—		$	—		$	663
Total revenues^(b)	$	2,876		$	1,179	$	569	$	320	$	—		$	(72	)	$	4,872
2017
Residential	$	1,135		$	651	$	—	$	—	$	—		$	—		$	1,786
Commercial	971			395		—		—		—			—			1,366
Industrial	242			83		—		—		—			—			325
Other	410			49		—		326		(2		)	(77		)	706
Total electric revenues	$	2,758		$	1,178	$	—	$	326	$	(2	)	$	(77	)	$	4,183
Residential	$	49		$	—	$	359	$	—	$	—		$	—		$	408
Commercial	20			—		100		—		—			—			120
Industrial	3			—		7		—		—			—			10
Other	11			—		44		—		—			(1		)	54
Total gas revenues	$	83		$	—	$	510	$	—	$	—		$	(1	)	$	592
Total revenues^(b)	$	2,841		$	1,178	$	510	$	326	$	(2	)	$	(78	)	$	4,775


(a)	Includes $13 million and $60 million for the three and nine months ended September 30, 2018, respectively, for the reduction to revenue for the excess amounts collected in rates related to the TCJA from January 1, 2018, through September 30, 2018. See Note 2 – Rate and Regulatory Matters for additional information.


(b)	The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 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	$	1		$	(98	)	$	(2	)	$	(12	)	$	(111	)
Other revenues not from contracts with customers	3			1			1			—			5
2017
Revenues from alternative revenue programs	$	(6	)	$	(96	)	$	(1	)	$	(2	)	$	(105	)
Other revenues not from contracts with customers	4			2			—			—			6
Nine Months
2018
Revenues from alternative revenue programs	$	(8	)	$	(52	)	$	(10	)	$	(21	)	$	(91	)
Other revenues not from contracts with customers	22			14			2			—			38
2017
Revenues from alternative revenue programs	$	(20	)	$	(47	)	$	11		$	5		$	(51	)
Other revenues not from contracts with customers	11			5			2			—			18

Ameren Illinois



Three Months	Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas		Ameren Illinois Transmission		Intersegment Eliminations			Total Ameren Illinois
2018
Residential	$	223	$	68	$	—	$	—		$	291
Commercial	131		20		—		—			151
Industrial	28		1		—		—			29
Other	10		27		71		(15		)	93
Total revenues^(a)	$	392	$	116	$	71	$	(15	)	$	564
2017
Residential	$	224	$	72	$	—	$	—		$	296
Commercial	133		21		—		—			154
Industrial	27		2		—		—			29
Other	20		17		72		(14		)	95
Total revenues^(a)	$	404	$	112	$	72	$	(14	)	$	574
Nine Months
2018
Residential	$	663	$	408	$	—	$	—		$	1,071
Commercial	381		113		—		—			494
Industrial	96		12		—		—			108
Other	39		36		195		(41		)	229
Total revenues^(a)	$	1,179	$	569	$	195	$	(41	)	$	1,902
2017
Residential	$	651	$	359	$	—	$	—		$	1,010
Commercial	395		100		—		—			495
Industrial	83		7		—		—			90
Other	49		44		197		(32		)	258
Total revenues^(a)	$	1,178	$	510	$	197	$	(32	)	$	1,853


(a)	The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2018 and 2017:



Three Months	Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Illinois Transmission			Consolidated
2018
Revenues from alternative revenue programs	$	(98	)	$	(2	)	$	(10	)	$	(110	)
Other revenues not from contracts with customers	1			1			—			2
2017
Revenues from alternative revenue programs	$	(96	)	$	(1	)	$	(2	)	$	(99	)
Other revenues not from contracts with customers	2			—			—			2
Nine Months
2018
Revenues from alternative revenue programs	$	(52	)	$	(10	)	$	(19	)	$	(81	)
Other revenues not from contracts with customers	14			2			—			16
2017
Revenues from alternative revenue programs	$	(47	)	$	11		$	3		$	(33	)
Other revenues not from contracts with customers	5			2			—			7