v3.26.3
Segment Information
 9 Months Ended
Sep. 30, 2026
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
The following tables present revenues, specified items reflected in 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, 2026 and 2025. 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
Reportable Segments
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
Three Months 2026:
External revenues$1,770 $774 $136 $202 $— $— $2,882 
Intersegment revenues11 3 — 64 — (78)— 
Revenue1,781 777 136 266 — (78)2,882 
Fuel and purchased power(a)
(509)(360)— — — 60 (809)
Natural gas purchased for resale(a)
(5)— (23)— — — (28)
Other operations and maintenance expenses(a)
(274)(182)(58)(34)(5)18 (535)
Other segment items
Depreciation and amortization(246)(100)(34)(55)(1)— (436)
Taxes other than income taxes(129)(23)(17)(2)(3)— (174)
Other income (expense), net58 17 3 6 30 (2)112 
Interest charges(82)(30)(18)(32)(56)2 (216)
Income (taxes) benefit(11)(27)4 (39)(46)— (119)
Noncontrolling interests – preferred stock dividends(1)— — — — — (1)
Net income (loss) attributable to Ameren common shareholders$582 $72 $(7)$110 $(81)$— $676 
Interest income$3 $5 $— $— $2 $(2)$8 
Capital expenditures979 223 81 153 — — 1,436 
Reportable Segments
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 shareholders$518 $57 $(13)$151 
(b)
$(73)$— $640 
Interest income$3 $6 $— $1 $1 $(1)$10 
Capital expenditures548 163 78 174 1 24 988 
Nine Months 2026:
External revenues$3,801 $2,046 $748 $555 $— $— $7,150 
Intersegment revenues34 3 — 167 — (204)— 
Revenue3,835 2,049 748 722 — (204)7,150 
Fuel and purchased power(a)
(1,041)(864)— — — 156 (1,749)
Natural gas purchased for resale(a)
(46)— (192)— — — (238)
Other operations and maintenance expenses(a)
(820)(507)(182)(74)(12)48 (1,547)
Other segment items
Depreciation and amortization(694)(294)(101)(160)(5)— (1,254)
Taxes other than income taxes(325)(66)(63)(7)(10)— (471)
Other income (expense), net171 54 10 19 72 (6)320 
Interest charges(247)(86)(51)(94)(157)6 (629)
Income (taxes) benefit(15)(77)(45)(102)8 — (231)
Noncontrolling interests – preferred stock dividends(3)(1)— — — — (4)
Net income (loss) attributable to Ameren common shareholders$815 $208 $124 $304 $(104)$— $1,347 
Interest income$8 $16 $— $— $6 $(6)$24 
Capital expenditures2,750 599 211 523 3 3 4,089 
Reportable Segments
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 shareholders$710 $184 $105 $326 
(b)
$(121)$— $1,204 
Interest income$7 $22 $— $2 $3 $(3)$31 
Capital expenditures1,873 483 225 505 6 26 3,118 
(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
Reportable Segments
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2026:
External revenues$777 $136 $140 $— $1,053 
Intersegment revenues— — 56 (56)— 
Revenue777 136 196 (56)1,053 
Purchased power(a)
(360)— — 56 (304)
Natural gas purchased for resale(a)
— (23)— — (23)
Other operations and maintenance expenses(a)
(182)(58)(25)— (265)
Other segment items
Depreciation and amortization(100)(34)(41)— (175)
Taxes other than income taxes(23)(17)(2)— (42)
Other income, net17 3 5 — 25 
Interest charges(30)(18)(24)— (72)
Income (taxes) benefit(27)4 (30)— (53)
Net income (loss) available to common shareholder72 (7)79 — 144 
Interest income5 — — — 5 
Capital expenditures223 81 78 — 382 
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) benefit(19)4 (2)— (17)
Net income (loss) available to common shareholder57 (13)104 — 148 
Interest income6 — 1 — 7 
Capital expenditures163 78 144 — 385 
Reportable Segments
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Nine Months 2026:
External revenues$2,049 $748 $383 $— $3,180 
Intersegment revenues— — 145 (145)— 
Revenue2,049 748 528 (145)3,180 
Purchased power(a)
(864)— — 145 (719)
Natural gas purchased for resale(a)
— (192)— — (192)
Other operations and maintenance expenses(a)
(507)(182)(56)— (745)
Other segment items
Depreciation and amortization(294)(101)(122)— (517)
Taxes other than income taxes(66)(63)(4)— (133)
Other income, net54 10 16 — 80 
Interest charges(86)(51)(72)— (209)
Income taxes(77)(45)(75)— (197)
Noncontrolling interests – preferred stock dividends(1)— — — (1)
Net income available to common shareholder$208 $124 $215 $— $547 
Interest income$16 $— $— $— $16 
Capital expenditures599 211 278 — 1,088 
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 shareholder$184 $105 $232 $— $521 
Interest income$22 $— $2 $— $24 
Capital expenditures483 225 419 — 1,127 
(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, 2026 and 2025. 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 2026:
Residential$773 $510 $— $— $— $1,283 
Commercial571 236 — — — 807 
Industrial126 38 — — — 164 
Other287 (7)
(a)
— 266 (78)468 
Total electric revenues$1,757 $777 $— $266 $(78)$2,722 
Residential$12 $— $79 $— $— $91 
Commercial6 — 24 — — 30 
Industrial— — 2 — — 2 
Other6 — 31 — — 37 
Total natural gas revenues$24 $— $136 $— $— $160 
Total revenues(b)
$1,781 $777 $136 $266 $(78)$2,882 
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 
Nine Months 2026:
Residential$1,598 $1,209 $— $— $— $2,807 
Commercial1,254 629 — — — 1,883 
Industrial292 145 — — — 437 
Other558 66 
(a)
— 722 (203)1,143 
Total electric revenues$3,702 $2,049 $— $722 $(203)$6,270 
Residential$76 $— $504 $— $— $580 
Commercial33 — 139 — — 172 
Industrial3 — 10 — — 13 
Other21 — 95 — (1)115 
Total natural gas revenues$133 $— $748 $— $(1)$880 
Total revenues(b)
$3,835 $2,049 $748 $722 $(204)$7,150 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
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)$7,017 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 30, 2026 and 2025:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2026:
Revenues from alternative revenue programs$(2)$(188)$(6)$(18)$— $(214)
Other revenues not from contracts with customers2 5 — — (2)5 
Three Months 2025:
Revenues from alternative revenue programs$— $(187)$(10)$(12)$— $(209)
Other revenues not from contracts with customers2 3 — — — 5 
Nine Months 2026:
Revenues from alternative revenue programs$(5)$(116)$21 $(25)$— $(125)
Other revenues not from contracts with customers6 10 2 — (4)14 
Nine Months 2025:
Revenues from alternative revenue programs$(4)$(174)$(6)$(21)$— $(205)
Other revenues not from contracts with customers5 11 2 — (4)14 
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2026:
Residential$510 $79 $— $— $589 
Commercial236 24 — — 260 
Industrial38 2 — — 40 
Other(7)
(a)
31 196 (56)164 
Total revenues(b)
$777 $136 $196 $(56)$1,053 
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 
Nine Months 2026:
Residential$1,209 $504 $— $— $1,713 
Commercial629 139 — — 768 
Industrial145 10 — — 155 
Other66 
(a)
95 528 (145)544 
Total revenues(b)
$2,049 $748 $528 $(145)$3,180 
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)$2,889 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2026 and 2025:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2026:
Revenues from alternative revenue programs$(188)$(6)$(17)$(211)
Other revenues not from contracts with customers5 — — 5 
Three Months 2025:
Revenues from alternative revenue programs$(187)$(10)$(12)$(209)
Other revenues not from contracts with customers3 — — 3 
Nine Months 2026:
Revenues from alternative revenue programs$(116)$21 $(23)$(118)
Other revenues not from contracts with customers10 2 — 12 
Nine Months 2025:
Revenues from alternative revenue programs$(174)$(6)$(20)$(200)
Other revenues not from contracts with customers11 2 — 13