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Segment Information
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
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, 2024 and 2023. 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 2024:
External revenues$1,333 $551 $121 $168 $— $— $2,173 
Intersegment revenues9 1 — 42 — (52)— 
Net income (loss) attributable to Ameren common shareholders381 56 (10)90 
(a)
(61)— 456 
Capital expenditures735 152 83 174 2 (9)1,137 
Three Months 2023:
External revenues$1,228 $557 $121 $154 $— $— $2,060 
Intersegment revenues9 1 1 34 — (45)— 
Net income (loss) attributable to Ameren common shareholders411 66 (5)86 
(a)
(65)— 493 
Capital expenditures341 177 80 160 2 (11)749 
Nine Months 2024:
External revenues$2,980 $1,566 $660 $476 $— $— $5,682 
Intersegment revenues25 1 — 110 — (136)— 
Net income (loss) attributable to Ameren common shareholders534 173 102 241 
(a)
(75)— 975 
Capital expenditures1,839 468 202 515 6 (1)3,029 
Nine Months 2023:
External revenues$3,074 $1,721 $664 $423 $— $— $5,882 
Intersegment revenues27 1 1 89 — (118)— 
Net income (loss) attributable to Ameren common shareholders541 193 93 229 
(a)
(62)— 994 
Capital expenditures1,255 527 221 570 7 (9)2,571 
(a)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent).
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2024:
External revenues$552 $121 $120 $— $793 
Intersegment revenues— — 35 (35)— 
Net income (loss) available to common shareholder56 (10)68 — 114 
Capital expenditures152 83 139 — 374 
Three Months 2023:
External revenues$558 $122 $103 $— $783 
Intersegment revenues— — 33 (33)— 
Net income (loss) available to common shareholder66 (5)64 — 125 
Capital expenditures177 80 125 — 382 
Nine Months 2024:
External revenues$1,567 $660 $332 $— $2,559 
Intersegment revenues— — 90 (90)— 
Net income available to common shareholder173 102 178 — 453 
Capital expenditures468 202 421 — 1,091 
Nine Months 2023:
External revenues$1,722 $665 $276 $— $2,663 
Intersegment revenues— — 87 (87)— 
Net income available to common shareholder193 93 166 — 452 
Capital expenditures527 221 478 — 1,226 
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2024 and 2023. 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, off-system sales, and capacity revenues.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2024:
Residential$590 $339 $— $— $— $929 
Commercial465 184 — — — 649 
Industrial108 38 — — — 146 
Other161 (9)
(a)
— 210 (51)311 
Total electric revenues$1,324 $552 $— $210 $(51)$2,035 
Residential$9 $— $77 $— $— $86 
Commercial5 — 19 — — 24 
Industrial— — 2 — — 2 
Other4 — 23 

— (1)26 
Total natural gas revenues$18 $— $121 $— $(1)$138 
Total revenues(b)
$1,342 $552 $121 $210 $(52)$2,173 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2023:
Residential$590 $330 $— $— $— $920 
Commercial468 189 — — — 657 
Industrial107 40 — — — 147 
Other54 

(1)
(a)
— 188 (44)197 

Total electric revenues$1,219 $558 $— $188 $(44)$1,921 
Residential$9 $— $75 $— $— $84 
Commercial5 — 19 — — 24 
Industrial1 — 1 — — 2 
Other3 — 27 — (1)29 
Total natural gas revenues$18 $— $122 $— $(1)$139 
Total revenues(b)
$1,237 $558 $122 $188 $(45)$2,060 
Nine Months 2024:
Residential$1,326 $947 $— $— $— $2,273 
Commercial1,048 512 — — — 1,560 
Industrial246 130 — — — 376 
Other282 (22)
(a)
— 586 (135)711 
Total electric revenues$2,902 $1,567 $— $586 $(135)$4,920 
Residential$62 $— $466 $— $— $528 
Commercial26 — 111 — — 137 
Industrial3 — 7 — — 10 
Other12 — 76 — (1)87 
Total natural gas revenues$103 $— $660 $— $(1)$762 
Total revenues(b)
$3,005 $1,567 $660 $586 $(136)$5,682 
Nine Months 2023:
Residential$1,274 $1,049 $— $— $— $2,323 
Commercial1,026 582 — — — 1,608 
Industrial243 136 — — — 379 
Other435 (45)
(a)
— 512 (116)786 
Total electric revenues$2,978 $1,722 $— $512 $(116)$5,096 
Residential$74 $— $469 $— $— $543 
Commercial34 — 121 — — 155 
Industrial4 — 10 — — 14 
Other11 — 65 — (2)74 
Total natural gas revenues$123 $— $665 $— $(2)$786 
Total revenues(b)
$3,101 $1,722 $665 $512 $(118)$5,882 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 30, 2024 and 2023:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2024:
Revenues from alternative revenue programs$— $(144)$(9)$(2)$(155)
Other revenues not from contracts with customers2 2 — — 4 
Three Months 2023:
Revenues from alternative revenue programs$(9)$(94)$(1)$(5)$(109)
Other revenues not from contracts with customers(1)
(a)
2 — — 1 
(a)
Nine Months 2024:
Revenues from alternative revenue programs$(7)$(83)$10 $11 $(69)
Other revenues not from contracts with customers4 5 2 — 11 
Nine Months 2023:
Revenues from alternative revenue programs$(11)$30 $36 $8 $63 
Other revenues not from contracts with customers(9)
(a)
6 2 — (1)
(a)
(a)Includes net realized losses on derivative power contracts.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2024:
Residential$339 $77 $— $— $416 
Commercial184 19 — — 203 
Industrial38 2 — — 40 
Other(9)
(a)
23 

155 (35)134 
Total revenues(b)
$552 $121 $155 $(35)$793 
Three Months 2023:
Residential$330 $75 $— $— $405 
Commercial189 19 — — 208 
Industrial40 1 — — 41 
Other(1)
(a)
27 136 (33)129 
Total revenues(b)
$558 $122 $136 $(33)$783 
Nine Months 2024:
Residential$947 $466 $— $— $1,413 
Commercial512 111 — — 623 
Industrial130 7 — — 137 
Other(22)
(a)
76 422 (90)386 
Total revenues(b)
$1,567 $660 $422 $(90)$2,559 
Nine Months 2023:
Residential$1,049 $469 $— $— $1,518 
Commercial582 121 — — 703 
Industrial136 10 — — 146 
Other(45)
(a)
65 363 (87)296 
Total revenues(b)
$1,722 $665 $363 $(87)$2,663 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2024 and 2023:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2024:
Revenues from alternative revenue programs$(144)$(9)$(1)$(154)
Other revenues not from contracts with customers2 — — 2 
Three Months 2023:
Revenues from alternative revenue programs$(94)$(1)$(6)$(101)
Other revenues not from contracts with customers2 — — 2 
Nine Months 2024:
Revenues from alternative revenue programs$(83)$10 $9 $(64)
Other revenues not from contracts with customers5 2 — 7 
Nine Months 2023:
Revenues from alternative revenue programs$30 $36 $4 $70 
Other revenues not from contracts with customers6 2 — 8