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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Schedule Of Segment Reporting Information By Segment
The following tables present revenues, net income (loss) attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2020 and 2019. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount. For additional information about our segments, see Note 16 – Segment Information under Part II, Item 8, of the Form 10-K.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
Three Months 2020:
External revenues$990 $390 $122 $126 $— $— $1,628 
Intersegment revenues11 1 — 15 
(a)
— (27)— 
Net income (loss) attributable to Ameren common shareholders297 34 2 62 
(b)
(28)— 367 
Capital expenditures262 129 81 185 2 (3)656 
Three Months 2019:
External revenues$1,050 $374 $107 $109 $— $— $1,640 
Intersegment revenues9 15 5 19 
(a)
— (29)19 
(c)
Net income (loss) attributable to Ameren common shareholders300 32 (1)53 
(b)
(20)— 364 
Capital expenditures256 139 113 129 (7)6 636 
Nine Months 2020:
External revenues$2,442 $1,131 $533 $360 $— $— $4,466 
Intersegment revenues31 2 — 40 
(a)
— (73)— 
Net income (loss) attributable to Ameren common shareholders439 107 66 168 
(b)
(24)— 756 
Capital expenditures778 391 221 490 4 — 1,884 
Nine Months 2019:
External revenues$2,591 $1,118 $563 $303 $— $— $4,575 
Intersegment revenues24 17 5 48 
(a)
— (75)19 
(c)
Net income (loss) attributable to Ameren common shareholders446 105 57 139 
(b)
(13)— 734 
Capital expenditures751 390 241 377 3 (1)1,761 
(a)Ameren Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution.
(b)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent).
(c)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 DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2020:
External revenues$391 $122 $76 $— $589 
Intersegment revenues— — 15 
(a)
(15)— 
Net income available to common shareholder34 2 41 — 77 
Capital expenditures129 81 160 — 370 
Three Months 2019:
External revenues$389 $112 $63 $— $564 
Intersegment revenues— — 18 
(a)
(18)— 
Net income (loss) available to common shareholder32 (1)34 — 65 
Capital expenditures139 113 92 — 344 
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Nine Months 2020:
External revenues$1,133 $533 $213 $— $1,879 
Intersegment revenues— — 39 
(a)
(39)— 
Net income available to common shareholder107 66 107 — 280 
Capital expenditures391 221 419 — 1,031 
Nine Months 2019:
External revenues$1,135 $568 $170 $— $1,873 
Intersegment revenues— — 47 
(a)
(47)— 
Net income available to common shareholder105 57 85 — 247 
Capital expenditures390 241 269 — 900 
(a)Ameren Illinois Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution.
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, 2020 and 2019. 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 MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2020:
Residential$455 $234 $— $— $— $689 
Commercial343 127 — — — 470 
Industrial87 26 — — — 113 
Other99 4 

— 141 (27)217 
Total electric revenues$984 $391 $— $141 $(27)$1,489 
Residential$8 $— $68 $— $— $76 
Commercial3 — 18 — — 21 
Industrial1 — 5 — — 6 
Other5 — 31 

— — 36 
Total gas revenues$17 $— $122 $— $— $139 
Total revenues(a)
$1,001 $391 $122 $141 $(27)$1,628 
Three Months 2019:
Residential$489 $224 $— $— $— $713 
Commercial394 123 — — — 517 
Industrial94 27 — — — 121 
Other63 

15 
(b)
— 128 (29)177 

Total electric revenues$1,040 $389 $— $128 $(29)$1,528 
Residential$8 $— $65 $— $— $73 
Commercial4 — 17 — — 21 
Industrial1 — 2 — — 3 
Other6 — 28 
(b)
— — 34 
Total gas revenues$19 $— $112 $— $— $131 
Total revenues(a)
$1,059 $389 $112 $128 $(29)$1,659 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Nine Months 2020:
Residential$1,111 $664 $— $— $— $1,775 
Commercial828 365 — — — 1,193 
Industrial207 91 — — — 298 
Other240 13 — 400 (73)580 
Total electric revenues$2,386 $1,133 $— $400 $(73)$3,846 
Residential$52 $— $375 $— $— $427 
Commercial20 — 94 — — 114 
Industrial3 — 11 — — 14 
Other12 — 53 — — 65 
Total natural gas revenues$87 $— $533 $— $— $620 
Total revenues(a)
$2,473 $1,133 $533 $400 $(73)$4,466 
Nine Months 2019:
Residential$1,134 $640 $— $— $— $1,774 
Commercial943 370 — — — 1,313 
Industrial226 94 — — — 320 
Other214 31 
(b)
— 351 (75)521 
Total electric revenues$2,517 $1,135 $— $351 $(75)$3,928 
Residential$56 $— $399 $— $— $455 
Commercial24 — 105 — — 129 
Industrial3 — 9 — — 12 
Other15 — 55 
(b)
— — 70 
Total natural gas revenues$98 $— $568 $— $— $666 
Total revenues(a)
$2,615 $1,135 $568 $351 $(75)$4,594 
(a)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, 2020 and 2019:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2020:
Revenues from alternative revenue programs$1 $(110)$3 $4 $(102)
Other revenues not from contracts with customers6 5 — — 11 
Three Months 2019:
Revenues from alternative revenue programs$26 $(145)$1 $(12)$(130)
Other revenues not from contracts with customers5 1 1 — 7 
Nine Months 2020:
Revenues from alternative revenue programs$(8)$(59)$17 $34 $(16)
Other revenues not from contracts with customers21 6 1 — 28 
Nine Months 2019:
Revenues from alternative revenue programs$41 $(111)$2 $(25)$(93)
Other revenues not from contracts with customers14 5 2 — 21 
(b)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.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2020:
Residential$234 $68 $— $— $302 
Commercial127 18 — — 145 
Industrial26 5 — — 31 
Other4 

31 

91 (15)111 
Total revenues(a)
$391 $122 $91 $(15)$589 
Three Months 2019:
Residential$224 $65 $— $— $289 
Commercial123 17 — — 140 
Industrial27 2 — — 29 
Other15 
(b)
28 
(b)
81 (18)106 
Total revenues(a)
$389 $112 $81 $(18)$564 
Nine Months 2020:
Residential$664 $375 $— $— $1,039 
Commercial365 94 — — 459 
Industrial91 11 — — 102 
Other13 53 252 (39)279 
Total revenues(a)
$1,133 $533 $252 $(39)$1,879 
Nine Months 2019:
Residential$640 $399 $— $— $1,039 
Commercial370 105 — — 475 
Industrial94 9 — — 103 
Other31 
(b)
55 
(b)
217 (47)256 
Total revenues(a)
$1,135 $568 $217 $(47)$1,873 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2020 and 2019:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2020:
Revenues from alternative revenue programs$(110)$3 $5 $(102)
Other revenues not from contracts with customers5 — — 5 
Three Months 2019:
Revenues from alternative revenue programs$(145)$1 $(12)$(156)
Other revenues not from contracts with customers1 1 — 2 
Nine Months 2020:
Revenues from alternative revenue programs$(59)$17 $29 $(13)
Other revenues not from contracts with customers6 1 — 7 
Nine Months 2019:
Revenues from alternative revenue programs$(111)$2 $(26)$(135)
Other revenues not from contracts with customers5 2 — 7 
(b)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.