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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
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, 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$879 $509 $148 $157 $— $— $1,693 
Intersegment revenues9 — — 34 — (43)— 
Net income (loss) attributable to Ameren common shareholders128 61 6 79 
(a)
(16)— 258 
Capital expenditures638 132 59 175 2 (4)1,002 
Three Months 2023:
External revenues$933 $540 $152 $135 $— $— $1,760 
Intersegment revenues8 — — 26 — (34)— 
Net income (loss) attributable to Ameren common shareholders102 66 11 72 
(a)
(14)— 237 
Capital expenditures433 180 90 197 2 (11)891 
Six Months 2024:
External revenues$1,647 $1,015 $539 $308 $— $— $3,509 
Intersegment revenues16 — — 68 — (84)— 
Net income (loss) attributable to Ameren common shareholders153 117 112 151 
(a)
(14)— 519 
Capital expenditures1,104 316 119 341 4 8 1,892 
Six Months 2023:
External revenues$1,846 $1,164 $543 $269 $— $— $3,822 
Intersegment revenues18 — — 55 — (73)— 
Net income attributable to Ameren common shareholders130 127 98 143 
(a)
3 — 501 
Capital expenditures914 350 141 410 5 2 1,822 
(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$509 $148 $109 $— $766 
Intersegment revenues— — 27 (27)— 
Net income available to common shareholder61 6 57 — 124 
Capital expenditures132 59 153 — 344 
Three Months 2023:
External revenues$540 $152 $87 $— $779 
Intersegment revenues— — 26 (26)— 
Net income available to common shareholder66 11 52 — 129 
Capital expenditures180 90 167 — 437 
Six Months 2024:
External revenues$1,015 $539 $212 $— $1,766 
Intersegment revenues— — 55 (55)— 
Net income available to common shareholder117 112 110 — 339 
Capital expenditures316 119 282 — 717 
Six Months 2023:
External revenues$1,164 $543 $173 $— $1,880 
Intersegment revenues— — 54 (54)— 
Net income available to common shareholder127 98 102 — 327 
Capital expenditures350 141 353 — 844 
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, 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$395 $311 $— $— $— $706 
Commercial324 163 — — — 487 
Industrial77 47 — — — 124 
Other68 (12)
(a)
— 191 (43)204 
Total electric revenues$864 $509 $— $191 $(43)$1,521 
Residential$13 $— $102 $— $— $115 
Commercial5 — 24 — — 29 
Industrial1 — 1 — — 2 
Other5 — 21 

— — 26 
Total natural gas revenues$24 $— $148 $— $— $172 
Total revenues(b)
$888 $509 $148 $191 $(43)$1,693 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2023:
Residential$360 $337 $— $— $— $697 
Commercial311 193 — — — 504 
Industrial75 48 — — — 123 
Other172 

(38)
(a)
— 161 (34)261 

Total electric revenues$918 $540 $— $161 $(34)$1,585 
Residential$13 $— $98 $— $— $111 
Commercial6 — 25 — — 31 
Industrial1 — 2 — — 3 
Other3 — 27 — — 30 
Total natural gas revenues$23 $— $152 $— $— $175 
Total revenues(b)
$941 $540 $152 $161 $(34)$1,760 
Six Months 2024:
Residential$736 $608 $— $— $— $1,344 
Commercial583 328 — — — 911 
Industrial138 92 — — — 230 
Other121 (13)
(a)
— 376 (84)400 
Total electric revenues$1,578 $1,015 $— $376 $(84)$2,885 
Residential$53 $— $389 $— $— $442 
Commercial21 — 92 — — 113 
Industrial3 — 5 — — 8 
Other8 — 53 — — 61 
Total natural gas revenues$85 $— $539 $— $— $624 
Total revenues(b)
$1,663 $1,015 $539 $376 $(84)$3,509 
Six Months 2023:
Residential$684 $719 $— $— $— $1,403 
Commercial558 393 — — — 951 
Industrial136 96 — — — 232 
Other381 (44)
(a)
— 324 (72)589 
Total electric revenues$1,759 $1,164 $— $324 $(72)$3,175 
Residential$65 $— $394 $— $— $459 
Commercial29 — 102 — — 131 
Industrial3 — 9 — — 12 
Other8 — 38 — (1)45 
Total natural gas revenues$105 $— $543 $— $(1)$647 
Total revenues(b)
$1,864 $1,164 $543 $324 $(73)$3,822 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2024 and 2023:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2024:
Revenues from alternative revenue programs$(1)$22 $— $4 $25 
Other revenues not from contracts with customers1 1 1 — 3 
Three Months 2023:
Revenues from alternative revenue programs$— $60 $9 $5 $74 
Other revenues not from contracts with customers(2)
(a)
2 1 — 1 
(a)
Six Months 2024:
Revenues from alternative revenue programs$(7)$61 $19 $13 $86 
Other revenues not from contracts with customers2 3 2 — 7 
Six Months 2023:
Revenues from alternative revenue programs$(2)$124 $37 $13 $172 
Other revenues not from contracts with customers(8)
(a)
4 2 — (2)
(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$311 $102 $— $— $413 
Commercial163 24 — — 187 
Industrial47 1 — — 48 
Other(12)
(a)
21 

136 (27)118 
Total revenues(b)
$509 $148 $136 $(27)$766 
Three Months 2023:
Residential$337 $98 $— $— $435 
Commercial193 25 — — 218 
Industrial48 2 — — 50 
Other(38)
(a)
27 113 (26)76 
Total revenues(b)
$540 $152 $113 $(26)$779 
Six Months 2024:
Residential$608 $389 $— $— $997 
Commercial328 92 — — 420 
Industrial92 5 — — 97 
Other(13)
(a)
53 267 (55)252 
Total revenues(b)
$1,015 $539 $267 $(55)$1,766 
Six Months 2023:
Residential$719 $394 $— $— $1,113 
Commercial393 102 — — 495 
Industrial96 9 — — 105 
Other(44)
(a)
38 227 (54)167 
Total revenues(b)
$1,164 $543 $227 $(54)$1,880 
(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 six months ended June 30, 2024 and 2023:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2024:
Revenues from alternative revenue programs$22 $— $2 $24 
Other revenues not from contracts with customers1 1 — 2 
Three Months 2023:
Revenues from alternative revenue programs$60 $9 $3 $72 
Other revenues not from contracts with customers2 1 — 3 
Six Months 2024:
Revenues from alternative revenue programs$61 $19 $10 $90 
Other revenues not from contracts with customers3 2 — 5 
Six Months 2023:
Revenues from alternative revenue programs$124 $37 $10 $171 
Other revenues not from contracts with customers4 2 — 6