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Segment Information
 9 Months Ended
Sep. 30, 2025
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, 2025 and 2024. 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 2025:
External revenues$1,696 $698 $117 $188 $— $— $2,699 
Intersegment revenues9 1 — 52 — (62)— 
Revenue1,705 699 117 240 — (62)2,699 
Fuel and purchased power(a)
(487)(330)— — — 49 (768)
Natural gas purchased for resale(a)
(6)— (19)— — — (25)
Other operations and maintenance expenses(a)
(260)(171)(55)(19)(10)13 (502)
Other segment items
Depreciation and amortization(239)(92)(33)(49)(2)— (415)
Taxes other than income taxes(122)(22)(15)(3)(2)— (164)
Other income (expense), net45 20 4 (3)11 (1)76 
Interest charges(85)(28)(16)(31)(49)1 (208)
Income taxes (benefit)(32)(19)4 16 (21)— (52)
Noncontrolling interests – preferred stock dividends(1)— — — — — (1)
Net income (loss) attributable to Ameren common shareholders518 57 (13)151 
(b)
(73)— 640 
Interest income3 6 — 1 1 (1)10 
Capital expenditures548 163 78 174 1 24 988 
Three Months 2024:
External revenues$1,333 $551 $121 $168 $— $— $2,173 
Intersegment revenues9 1 — 42 — (52)— 
Revenue1,342 552 121 210 — (52)2,173 
Fuel and purchased power(a)
(334)(204)— — — 39 (499)
Natural gas purchased for resale(a)
(4)— (26)— — — (30)
Other operations and maintenance expenses(a)
(288)(163)(51)(19)(12)13 (520)
Other segment items
Depreciation and amortization(220)(92)(32)(42)(2)— (388)
Taxes other than income taxes(109)(21)(14)(2)(4)— (150)
Other income (expense), net51 23 6 8 16 (3)101 
Interest charges(62)(25)(16)(31)(42)3 (173)
Income taxes (benefit)6 (14)2 (34)(17)— (57)
Noncontrolling interests – preferred stock dividends(1)— — — — — (1)
Net income (loss) attributable to Ameren common shareholders381 56 (10)90 
(b)
(61)— 456 
Interest income2 6 1 — 2 (3)8 
Capital expenditures735 152 83 174 2 (9)1,137 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
Nine Months 2025:
External revenues$3,978 $1,838 $686 $515 $— $— $7,017 
Intersegment revenues24 6 — 143 — (173)— 
Revenue4,002 1,844 686 658 — (173)7,017 
Fuel and purchased power(a)
(1,431)(765)— — — 132 (2,064)
Natural gas purchased for resale(a)
(45)— (188)— — — (233)
Other operations and maintenance expenses(a)
(748)(493)(165)(56)(26)41 (1,447)
Other segment items
Depreciation and amortization(642)(276)(98)(146)(6)— (1,168)
Taxes other than income taxes(300)(63)(60)(7)(9)— (439)
Other income (expense), net135 66 14 14 31 (3)257 
Interest charges(215)(80)(47)(89)(142)3 (570)
Income (taxes) benefit(43)(48)(37)(48)31 — (145)
Noncontrolling interests – preferred stock dividends(3)(1)— — — — (4)
Net income (loss) attributable to Ameren common shareholders710 184 105 326 
(b)
(121)— 1,204 
Interest income7 22 — 2 3 (3)31 
Capital expenditures1,873 483 225 505 6 26 3,118 
Nine Months 2024:
External revenues$2,980 $1,566 $660 $476 $— $— $5,682 
Intersegment revenues25 1 — 110 — (136)— 
Revenue3,005 1,567 660 586 — (136)5,682 
Fuel and purchased power(a)
(689)(564)— — — 99 (1,154)
Natural gas purchased for resale(a)
(41)— (173)— — — (214)
Other operations and maintenance expenses(a)
(789)(452)(168)(54)(29)37 (1,455)
Other segment items
Depreciation and amortization(623)(278)(98)(121)(5)— (1,125)
Taxes other than income taxes(287)(57)(55)(6)(11)— (416)
Other income (expense), net144 72 20 14 54 (11)293 
Interest charges(187)(73)(46)(89)(108)11 (492)
Income (taxes) benefit4 (41)(38)(89)24 — (140)
Noncontrolling interests – preferred stock dividends(3)(1)— — — — (4)
Net income (loss) attributable to Ameren common shareholders534 173 102 241 
(b)
(75)— 975 
Interest income7 21 1 1 10 (11)29 
Capital expenditures1,839 468 202 515 6 (1)3,029 
(a)Significant segment expense that is regularly provided to the CODMs. Intersegment expenses are included within the amounts shown.
(b)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 2025:
External revenues$699 $117 $130 $— $946 
Intersegment revenues— — 46 (46)— 
Revenue699 117 176 (46)946 
Purchased power(a)
(330)— — 46 (284)
Natural gas purchased for resale(a)
— (19)— — (19)
Other operations and maintenance expenses(a)
(171)(55)(15)— (241)
Other segment items
Depreciation and amortization(92)(33)(37)— (162)
Taxes other than income taxes(22)(15)(1)— (38)
Other income, net20 4 6 — 30 
Interest charges(28)(16)(23)— (67)
Income taxes(19)4 (2)— (17)
Net income (loss) available to common shareholder57 (13)104 — 148 
Interest income6 — 1 — 7 
Capital expenditures163 78 144 — 385 
Three Months 2024:
External revenues$552 $121 $120 $— $793 
Intersegment revenues— — 35 (35)— 
Revenue552 121 155 (35)793 
Purchased power(a)
(204)— — 35 (169)
Natural gas purchased for resale(a)
— (26)— — (26)
Other operations and maintenance expenses(a)
(163)(51)(15)— (229)
Other segment items
Depreciation and amortization(92)(32)(31)— (155)
Taxes other than income taxes(21)(14)(2)— (37)
Other income, net23 6 8 — 37 
Interest charges(25)(16)(22)— (63)
Income taxes(14)2 (25)— (37)
Net income (loss) available to common shareholder56 (10)68 — 114 
Interest income6 1 — — 7 
Capital expenditures152 83 139 — 374 
Nine Months 2025:
External revenues$1,844 $686 $359 $— $2,889 
Intersegment revenues— — 123 (123)— 
Revenue1,844 686 482 (123)2,889 
Purchased power(a)
(765)— — 123 (642)
Natural gas purchased for resale(a)
— (188)— (188)
Other operations and maintenance expenses(a)
(493)(165)(44)(702)
Other segment items
Depreciation and amortization(276)(98)(110)(484)
Taxes other than income taxes(63)(60)(3)(126)
Other income, net66 14 21 101 
Interest charges(80)(47)(65)(192)
Income taxes(48)(37)(49)(134)
Noncontrolling interests – preferred stock dividends(1)— — (1)
Net income available to common shareholder184 105 232 — 521 
Interest income22 — 2 — 24 
Capital expenditures483 225 419 — 1,127 
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Nine Months 2024:
External revenues$1,567 $660 $332 $— $2,559 
Intersegment revenues— — 90 (90)— 
Revenue1,567 660 422 (90)2,559 
Purchased power(a)
(564)— — 90 (474)
Natural gas purchased for resale(a)
— (173)— (173)
Other operations and maintenance expenses(a)
(452)(168)(43)(663)
Other segment items
Depreciation and amortization(278)(98)(86)(462)
Taxes other than income taxes(57)(55)(4)(116)
Other income, net72 20 13 105 
Interest charges(73)(46)(59)(178)
Income taxes(41)(38)(65)(144)
Noncontrolling interests – preferred stock dividends(1)— — (1)
Net income available to common shareholder173 102 178 — 453 
Interest income21 1 — — 22 
Capital expenditures468 202 421 — 1,091 
(a)Significant segment expense that is regularly provided to the CODMs. Intersegment expenses are included within the amounts shown.
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2025 and 2024. 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 2025:
Residential$702 $469 $— $— $— $1,171 
Commercial537 235 — — — 772 
Industrial119 46 — — — 165 
Other327 (51)
(a)
— 240 (61)455 
Total electric revenues$1,685 $699 $— $240 $(61)$2,563 
Residential$9 $— $70 $— $— $79 
Commercial5 — 21 — — 26 
Industrial— — 2 — — 2 
Other6 — 24 — (1)29 
Total natural gas revenues$20 $— $117 $— $(1)$136 
Total revenues(b)
$1,705 $699 $117 $240 $(62)$2,699 
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 
Nine Months 2025:
Residential$1,483 $1,132 $— $— $— $2,615 
Commercial1,154 596 — — — 1,750 
Industrial269 144 — — — 413 
Other987 (28)
(a)
— 658 (172)1,445 
Total electric revenues$3,893 $1,844 $— $658 $(172)$6,223 
Residential$65 $— $486 $— $— $551 
Commercial29 — 126 — — 155 
Industrial3 — 9 — — 12 
Other12 — 65 — (1)76 
Total natural gas revenues$109 $— $686 $— $(1)$794 
Total revenues(b)
$4,002 $1,844 $686 $658 $(173)$7,017 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
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)$5,682 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 30, 2025 and 2024:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2025:
Revenues from alternative revenue programs$— $(187)$(10)$(12)$— $(209)
Other revenues not from contracts with customers2 3 — — — 5 
Three Months 2024:
Revenues from alternative revenue programs$— $(144)$(9)$(2)$— $(155)
Other revenues not from contracts with customers2 2 — — — 4 
Nine Months 2025:
Revenues from alternative revenue programs$(4)$(174)$(6)$(21)$— $(205)
Other revenues not from contracts with customers5 11 2 — (4)14 
Nine Months 2024:
Revenues from alternative revenue programs$(7)$(83)$10 $11 $— $(69)
Other revenues not from contracts with customers4 5 2 — — 11 
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2025:
Residential$469 $70 $— $— $539 
Commercial235 21 — — 256 
Industrial46 2 — — 48 
Other(51)
(a)
24 176 (46)103 
Total revenues(b)
$699 $117 $176 $(46)$946 
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 
Nine Months 2025:
Residential$1,132 $486 $— $— $1,618 
Commercial596 126 — — 722 
Industrial144 9 — — 153 
Other(28)
(a)
65 482 (123)396 
Total revenues(b)
$1,844 $686 $482 $(123)$2,889 
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)$2,559 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2025 and 2024:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2025:
Revenues from alternative revenue programs$(187)$(10)$(12)$(209)
Other revenues not from contracts with customers3 — — 3 
Three Months 2024:
Revenues from alternative revenue programs$(144)$(9)$(1)$(154)
Other revenues not from contracts with customers2 — — 2 
Nine Months 2025:
Revenues from alternative revenue programs$(174)$(6)$(20)$(200)
Other revenues not from contracts with customers11 2 — 13 
Nine Months 2024:
Revenues from alternative revenue programs$(83)$10 $9 $(64)
Other revenues not from contracts with customers5 2 — 7