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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2024
Segment Reporting [Abstract]  
Schedule Of Segment Reporting Information, By Segment
The following tables present information about the reported revenue and specified items reflected in net income attributable to common shareholders and capital expenditures by segment at Ameren and Ameren Illinois for the years ended December 31, 2024, 2023, and 2022. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
2024
External revenues$3,960 $2,088 $938 $637 $— $— $7,623 
Intersegment revenues33 1 — 144 — (178)— 
Revenue3,993 2,089 938 781 — (178)7,623 
Fuel and purchased power(a)
(1,071)(740)— — — 130 (1,681)
Natural gas purchased for resale(a)
(60)— (260)— — — (320)
Other operations and maintenance expenses(a)
(1,050)(619)(230)(70)(48)48 (1,969)
Other segment items
Depreciation and amortization(917)(369)(129)(167)(8)— (1,590)
Taxes other than income taxes(372)(75)(78)(9)(13)— (547)
Other income, net196 97 27 26 83 (12)417 
Interest charges(244)(98)(63)(117)
(b)
(153)12 (663)
Income taxes (benefit)87 (50)(56)(120)56 — (83)
Noncontrolling interests – preferred stock dividends(3)(1)— (1)— — (5)
Net income (loss) attributable to Ameren common shareholders559 234 149 323 (83)— 1,182 
Interest income8 28 1 6 10 (12)41 
Capital expenditures2,712 579 264 758 7 (1)4,319 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
2023
External revenues$3,825 $2,217 $897 $561 $— $— $7,500 
Intersegment revenues34 1 — 116 — (151)— 
Revenue3,859 2,218 897 677 — (151)7,500 
Fuel and purchased power(a)
(997)(933)— — — 118 (1,812)
Natural gas purchased for resale(a)
(79)— (276)— — — (355)
Other operations and maintenance expenses(a)
(1,003)(532)(237)(60)(67)33 (1,866)
Other segment items
Depreciation and amortization(783)(351)(108)(138)(7)— (1,387)
Taxes other than income taxes(360)(75)(67)(8)(12)— (522)
Other income, net130 103 30 28 62 (5)348 
Interest charges(227)(89)(55)(96)
(b)
(104)5 (566)
Income taxes (benefit)8 (82)(50)(106)47 — (183)
Noncontrolling interests – preferred stock dividends(3)(1)— (1)— — (5)
Net income (loss) attributable to Ameren common shareholders545 258 134 296 (81)— 1,152 
Interest income11 19 1 2 5 (5)33 
Capital expenditures1,760 752 299 804 9 (27)3,597 
2022
External revenues$4,012 $2,255 $1,180 $510 $— $— $7,957 
Intersegment revenues34 1 — 105 — (140)— 
Revenue4,046 2,256 1,180 615 — (140)7,957 
Fuel and purchased power(a)
(1,150)(984)— — — 114 (2,020)
Natural gas purchased for resale(a)
(104)— (553)— — — (657)
Other operations and maintenance expenses(a)
(1,028)(580)(253)(60)(42)26 (1,937)
Other segment items
Depreciation and amortization(732)(332)(98)(123)(4)— (1,289)
Taxes other than income taxes(363)(75)(82)(9)(10)— (539)
Other income, net99 60 19 17 32 (1)226 
Interest charges(213)(74)(44)(84)
(b)
(72)1 (486)
Income taxes (benefit)10 (68)(46)(92)20 — (176)
Noncontrolling interests – preferred stock dividends(3)(1)— (1)— — (5)
Net income (loss) attributable to Ameren common shareholders562 202 123 263 (76)— 1,074 
Interest income28 7 — — 1 (1)35 
Capital expenditures1,690 621 308 741 7 (16)3,351 
(a)Significant segment expense that is regularly provided to the CODMs. Intersegment expenses are included within the amounts shown.
(b)Ameren Transmission interest charges include an allocation of financing costs from Ameren (parent).
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois
Natural Gas		Ameren Illinois TransmissionIntersegment EliminationsAmeren Illinois
2024
External revenues$2,089 $938 $445 $— $3,472 
Intersegment revenues— — 119 (119)— 
Revenue2,089 938 564 (119)3,472 
Purchased power(a)
(740)— — 119 (621)
Natural gas purchased for resale(a)
— (260)— — (260)
Other operations and maintenance expenses(a)
(619)(230)(57)— (906)
Other segment items
Depreciation and amortization(369)(129)(121)— (619)
Taxes other than income taxes(75)(78)(4)— (157)
Other income, net97 27 23 — 147 
Interest charges(98)(63)(80)— (241)
Income taxes(50)(56)(87)— (193)
Noncontrolling interests – preferred stock dividends(1)— (1)— (2)
Net income available to common shareholder234 149 237 — 620 
Interest income28 1 3 — 32 
Capital expenditures579 264 624 — 1,467 
2023
External revenues$2,218 $897 $367 $— $3,482 
Intersegment revenues— — 113 (113)— 
Revenue2,218 897 480 (113)3,482 
Purchased power(a)
(933)— — 113 (820)
Natural gas purchased for resale(a)
— (276)— — (276)
Other operations and maintenance expenses(a)
(532)(237)(49)— (818)
Other segment items
Depreciation and amortization(351)(108)(97)— (556)
Taxes other than income taxes(75)(67)(4)— (146)
Other income, net103 30 23 — 156 
Interest charges(89)(55)(60)— (204)
Income taxes(82)(50)(77)— (209)
Noncontrolling interests – preferred stock dividends(1)— (1)— (2)
Net income available to common shareholder258 134 215 — 607 
Interest income19 1 1 — 21 
Capital expenditures752 299 680 — 1,731 
Ameren Illinois Electric DistributionAmeren Illinois
Natural Gas		Ameren Illinois TransmissionIntersegment EliminationsAmeren Illinois
2022
External revenues$2,256 $1,180 $320 $— $3,756 
Intersegment revenues— — 104 (104)— 
Revenue2,256 1,180 424 (104)3,756 
Purchased power(a)
(984)— — 104 (880)
Natural gas purchased for resale(a)
— (553)— — (553)
Other operations and maintenance expenses(a)
(580)(253)(49)— (882)
Other segment items
Depreciation and amortization(332)(98)(84)— (514)
Taxes other than income taxes(75)(82)(4)— (161)
Other income, net60 19 17 — 96 
Interest charges(74)(44)(50)— (168)
Income taxes(68)(46)(65)— (179)
Noncontrolling interests – preferred stock dividends(1)— (1)— (2)
Net income available to common shareholder202 123 188 — 513 
Interest income7 — — — 7 
Capital expenditures621 308 672 — 1,601 
(a)Significant segment expense that is regularly provided to the CODMs. Intersegment expenses are included within the amounts shown.
Disaggregation of Revenue
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the years ended December 31, 2024, 2023, and 2022. 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 sales and capacity revenues.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
2024
Residential$1,638 $1,254 $— $— $— $2,892 
Commercial1,313 680 — — — 1,993 
Industrial311 178 — — — 489 
Other585 (23)— 781 (177)1,166 
Total electric revenues$3,847 $2,089 $— $781 $(177)$6,540 
Residential$90 $— $661 $— $— $751 
Commercial37 — 166 — — 203 
Industrial4 — 10 — — 14 
Other15 — 101 — (1)115 
Total gas revenues$146 $— $938 $— $(1)$1,083 
Total revenues(a)
$3,993 $2,089 $938 $781 $(178)$7,623 
2023
Residential$1,577 $1,344 $— $— $— $2,921 
Commercial1,280 747 — — — 2,027 
Industrial306 186 — — — 492 
Other531 (59)— 677 (150)999 
Total electric revenues$3,694 $2,218 $— $677 $(150)$6,439 
Residential$100 $— $657 $— $— $757 
Commercial46 — 164 — — 210 
Industrial5 — 14 — — 19 
Other14 — 62 — (1)75 
Total gas revenues$165 $— $897 $— $(1)$1,061 
Total revenues(a)
$3,859 $2,218 $897 $677 $(151)$7,500 
2022
Residential$1,578 $1,325 $— $— $— $2,903 
Commercial1,219 768 — — — 1,987 
Industrial290 199 — — — 489 
Other762 (36)— 615 (139)1,202 
Total electric revenues$3,849 $2,256 $— $615 $(139)$6,581 
Residential$119 $— $846 $— $— $965 
Commercial56 — 221 — — 277 
Industrial7 — 41 — — 48 
Other15 — 72 — (1)86 
Total gas revenues$197 $— $1,180 $— $(1)$1,376 
Total revenues(a)
$4,046 $2,256 $1,180 $615 $(140)$7,957 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the years ended December 31, 2024, 2023, and 2022:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
2024
Revenues from alternative revenue programs$4 $(43)$(3)$33 $(9)
Other revenues not from contracts with customers7 
(a)
10 2 — 19 
(a)
2023
Revenues from alternative revenue programs$(5)$116 $49 $19 $179 
Other revenues not from contracts with customers(9)
(a)
7 2 — — 
(a)
2022
Revenues from alternative revenue programs$17 $89 $(19)$(9)$78 
Other revenues not from contracts with customers(103)
(a)(b)
6 3 — (94)
(a)(b)
(a)Includes net realized gains and losses on derivative power contracts.
(b)Includes $10 million for insurance recoveries related to lost sales associated with the Callaway Energy Center maintenance outage for the year ended December 31, 2022.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
2024
Residential$1,254 $661 $— $— $1,915 
Commercial680 166 — — 846 
Industrial178 10 — — 188 
Other(23)101 564 (119)523 
Total revenues(a)
$2,089 $938 $564 $(119)$3,472 
2023
Residential$1,344 $657 $— $— $2,001 
Commercial747 164 — — 911 
Industrial186 14 — — 200 
Other(59)62 480 (113)370 
Total revenues(a)
$2,218 $897 $480 $(113)$3,482 
2022
Residential$1,325 $846 $— $— $2,171 
Commercial768 221 — — 989 
Industrial199 41 — — 240 
Other(36)72 424 (104)356 
Total revenues(a)
$2,256 $1,180 $424 $(104)$3,756 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the years ended December 31, 2024, 2023, and 2022:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
2024
Revenues from alternative revenue programs$(43)$(3)$29 $(17)
Other revenues not from contracts with customers10 2 — 12 
2023
Revenues from alternative revenue programs$116 $49 $12 $177 
Other revenues not from contracts with customers7 2 — 9 
2022
Revenues from alternative revenue programs$89 $(19)$(7)$63 
Other revenues not from contracts with customers6 3 — 9