Segment Information

9 Months Ended

Sep. 30, 2019

Ameren has four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. The Ameren Missouri segment includes all of the operations of Ameren Missouri. Ameren Illinois Electric Distribution consists of the electric distribution business of Ameren Illinois. Ameren Illinois Natural Gas consists of the natural gas business of Ameren Illinois. Ameren Transmission primarily consists of the aggregated electric transmission businesses of Ameren Illinois and ATXI. The category called Other primarily includes Ameren (parent) activities and Ameren Services.

Ameren Missouri has one segment. Ameren Illinois has three segments: Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Illinois Transmission. See Note 1 – Summary of Significant Accounting Policies for additional information regarding the operations of Ameren Missouri, Ameren Illinois, and ATXI.

Segment operating revenues and a majority of operating expenses are directly recognized and incurred by Ameren Illinois at each Ameren Illinois segment. Common operating expenses, miscellaneous income and expenses, interest charges, and income tax expense are allocated by Ameren Illinois to each Ameren Illinois segment based on factors that primarily relate to the nature of the cost. Additionally, Ameren Illinois Transmission earns revenue from transmission services provided to Ameren Illinois Electric Distribution, other retail electric suppliers, and wholesale customers. The transmission expense for Illinois customers who have elected to purchase their power from Ameren Illinois is recovered through a cost recovery mechanism with no net effect on Ameren Illinois Electric Distribution earnings, as costs are offset by corresponding revenues. Transmission revenues from these transactions are reflected in Ameren Transmission’s and Ameren Illinois Transmission’s operating revenues. An intersegment elimination at Ameren and Ameren Illinois occurs to eliminate these transmission revenues and expenses.

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, 2019 and 2018. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount.

Ameren



	Ameren Missouri		Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas			Ameren Transmission			Other			Intersegment Eliminations			Ameren
Three Months 2019:
External revenues	$	1,050	$	374	$	107		$	109		$	—		$	—		$	1,640
Intersegment revenues	9		15		5			19			—			(29		)	19		^(b)
Net income (loss) attributable to Ameren common shareholders	300		32		(1		)	53		^(a)	(20		)	—			364
Capital expenditures	256		139		113			129			(7		)	6			636
Three Months 2018:
External revenues	$	1,118	$	392	$	116		$	98		$	—		$	—		$	1,724
Intersegment revenues	11		—		—			15			—			(26		)	—
Net income (loss) attributable to Ameren common shareholders	294		35		—			48		^(a)	(20		)	—			357
Capital expenditures	210		135		111			124			1			(4		)	577
Nine Months 2019:
External revenues	$	2,591	$	1,118	$	563		$	303		$	—		$	—		$	4,575
Intersegment revenues	24		17		5			48			—			(75		)	19		^(b)
Net income (loss) attributable to Ameren common shareholders	446		105		57			139		^(a)	(13		)	—			734
Capital expenditures	751		390		241			377			3			(1		)	1,761
Nine Months 2018:
External revenues	$	2,848	$	1,177	$	569		$	278		$	—		$	—		$	4,872
Intersegment revenues	28		2		—			42			—			(72		)	—
Net income (loss) attributable to Ameren common shareholders	500		101		49			121		^(a)	(24		)	—			747
Capital expenditures	664		389		237			399			6			(6		)	1,689


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

(b)

Intersegment revenues at Ameren include $14 million and $5 million of revenue from Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. Under authoritative accounting guidance for rate-regulated entities, the revenue recognized by Ameren Illinois was not eliminated upon consolidation. See Note 8 – Related-party Transactions under Part I, Item 1, of this report for additional information.

Ameren Illinois



	Ameren Illinois Electric Distribution		Ameren Illinois Natural Gas			Ameren Illinois Transmission		Intersegment Eliminations			Ameren Illinois
Three Months 2019:
External revenues	$	389	$	112		$	63	$	—		$	564
Intersegment revenues	—		—			18		(18		)	—
Net income (loss) available to common shareholder	32		(1		)	34		—			65
Capital expenditures	139		113			92		—			344
Three Months 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
Nine Months 2019:
External revenues	$	1,135	$	568		$	170	$	—		$	1,873
Intersegment revenues	—		—			47		(47		)	—
Net income available to common shareholder	105		57			85		—			247
Capital expenditures	390		241			269		—			900
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

The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2019 and 2018. 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



	Ameren Missouri		Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Transmission		Intersegment Eliminations			Ameren
Three Months 2019:
Residential	$	489	$	224		$	—		$	—	$	—		$	713
Commercial	394		123			—			—		—			517
Industrial	94		27			—			—		—			121
Other	63		15		^(a)	—			128		(29		)	177
Total electric revenues	$	1,040	$	389		$	—		$	128	$	(29	)	$	1,528
Residential	$	8	$	—		$	65		$	—	$	—		$	73
Commercial	4		—			17			—		—			21
Industrial	1		—			2			—		—			3
Other	6		—			28		^(a)	—		—			34
Total gas revenues	$	19	$	—		$	112		$	—	$	—		$	131
Total revenues^(c)	$	1,059	$	389		$	112		$	128	$	(29	)	$	1,659



	Ameren Missouri			Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Transmission		Intersegment Eliminations			Ameren
Three Months 2018:
Residential	$	508		$	223		$	—		$	—	$	—		$	731
Commercial	417			131			—			—		—			548
Industrial	101			28			—			—		—			129
Other	85		^(b)	10			—			113		(26		)	182		^(b)
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^(c)	$	1,129		$	392		$	116		$	113	$	(26	)	$	1,724
Nine Months 2019:
Residential	$	1,134		$	640		$	—		$	—	$	—		$	1,774
Commercial	943			370			—			—		—			1,313
Industrial	226			94			—			—		—			320
Other	214			31		^(a)	—			351		(75		)	521
Total electric revenues	$	2,517		$	1,135		$	—		$	351	$	(75	)	$	3,928
Residential	$	56		$	—		$	399		$	—	$	—		$	455
Commercial	24			—			105			—		—			129
Industrial	3			—			9			—		—			12
Other	15			—			55		^(a)	—		—			70
Total gas revenues	$	98		$	—		$	568		$	—	$	—		$	666
Total revenues^(c)	$	2,615		$	1,135		$	568		$	351	$	(75	)	$	4,594
Nine Months 2018:
Residential	$	1,272		$	663		$	—		$	—	$	—		$	1,935
Commercial	1,033			381			—			—		—			1,414
Industrial	249			96			—			—		—			345
Other	228		^(b)	39			—			320		(72		)	515		^(b)
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^(c)	$	2,876		$	1,179		$	569		$	320	$	(72	)	$	4,872


(a)	Includes $14 million and $5 million for Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. See Note 8 – Related-party Transactions for additional information.


(b)	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 to be refunded related to the TCJA from January 1, 2018, through July 31, 2018. See Note 2 – Rate and Regulatory Matters under Part II, Item 8, of the Form 10-K for additional information.


(c)	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, 2019 and 2018:



	Ameren Missouri		Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Transmission			Ameren
Three Months 2019:
Revenues from alternative revenue programs	$	26	$	(145	)	$	1		$	(12	)	$	(130	)
Other revenues not from contracts with customers	5		1			1			—			7
Three Months 2018:
Revenues from alternative revenue programs	$	1	$	(98	)	$	(2	)	$	(12	)	$	(111	)
Other revenues not from contracts with customers	3		1			1			—			5



	Ameren Missouri			Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Transmission			Ameren
Nine Months 2019:
Revenues from alternative revenue programs	$	41		$	(111	)	$	2		$	(25	)	$	(93	)
Other revenues not from contracts with customers	14			5			2			—			21
Nine Months 2018:
Revenues from alternative revenue programs	$	(8	)	$	(52	)	$	(10	)	$	(21	)	$	(91	)
Other revenues not from contracts with customers	22			14			2			—			38

Ameren Illinois



	Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Illinois Transmission		Intersegment Eliminations			Ameren Illinois
Three Months 2019:
Residential	$	224		$	65		$	—	$	—		$	289
Commercial	123			17			—		—			140
Industrial	27			2			—		—			29
Other	15		^(a)	28		^(a)	81		(18		)	106
Total revenues^(b)	$	389		$	112		$	81	$	(18	)	$	564
Three Months 2018:
Residential	$	223		$	68		$	—	$	—		$	291
Commercial	131			20			—		—			151
Industrial	28			1			—		—			29
Other	10			27			71		(15		)	93
Total revenues^(b)	$	392		$	116		$	71	$	(15	)	$	564
Nine Months 2019:
Residential	$	640		$	399		$	—	$	—		$	1,039
Commercial	370			105			—		—			475
Industrial	94			9			—		—			103
Other	31		^(a)	55		^(a)	217		(47		)	256
Total revenues^(b)	$	1,135		$	568		$	217	$	(47	)	$	1,873
Nine Months 2018:
Residential	$	663		$	408		$	—	$	—		$	1,071
Commercial	381			113			—		—			494
Industrial	96			12			—		—			108
Other	39			36			195		(41		)	229
Total revenues^(b)	$	1,179		$	569		$	195	$	(41	)	$	1,902


(a)	Includes $14 million and $5 million for Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. See Note 8 – Related-party Transactions 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 Ameren Illinois segments for the three and nine months ended September 30, 2019 and 2018:



	Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Illinois Transmission			Ameren Illinois
Three Months 2019:
Revenues from alternative revenue programs	$	(145	)	$	1		$	(12	)	$	(156	)
Other revenues not from contracts with customers	1			1			—			2
Three Months 2018:
Revenues from alternative revenue programs	$	(98	)	$	(2	)	$	(10	)	$	(110	)
Other revenues not from contracts with customers	1			1			—			2



	Ameren Illinois Electric Distribution			Ameren Illinois Natural Gas			Ameren Illinois Transmission			Ameren Illinois
Nine Months 2019:
Revenues from alternative revenue programs	$	(111	)	$	2		$	(26	)	$	(135	)
Other revenues not from contracts with customers	5			2			—			7
Nine Months 2018:
Revenues from alternative revenue programs	$	(52	)	$	(10	)	$	(19	)	$	(81	)
Other revenues not from contracts with customers	14			2			—			16