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Segment Information | 9 Months Ended
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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 Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  | Other |  | Intersegment Eliminations |  | Ameren |
Three Months 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 1,696 |  |  | $ | 698 |  |  | $ | 117 |  |  | $ | 188 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,699 |  |
Intersegment revenues | 9 |  |  | 1 |  |  | — |  |  | 52 |  |  | — |  |  | (62) |  |  | — |  |
Revenue | 1,705 |  |  | 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), net | 45 |  |  | 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 expenditures | 548 |  |  | 163 |  |  | 78 |  |  | 174 |  |  | 1 |  |  | 24 |  |  | 988 |  |
Three Months 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 1,333 |  |  | $ | 551 |  |  | $ | 121 |  |  | $ | 168 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,173 |  |
Intersegment revenues | 9 |  |  | 1 |  |  | — |  |  | 42 |  |  | — |  |  | (52) |  |  | — |  |
Revenue | 1,342 |  |  | 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), net | 51 |  |  | 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 shareholders | 381 |  |  | 56 |  |  | (10) |  |  | 90 |  | (b) | (61) |  |  | — |  |  | 456 |  |
Interest income | 2 |  |  | 6 |  |  | 1 |  |  | — |  |  | 2 |  |  | (3) |  |  | 8 |  |
Capital expenditures | 735 |  |  | 152 |  |  | 83 |  |  | 174 |  |  | 2 |  |  | (9) |  |  | 1,137 |  |
| Ameren Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  | Other |  | Intersegment Eliminations |  | Ameren |
Nine Months 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 3,978 |  |  | $ | 1,838 |  |  | $ | 686 |  |  | $ | 515 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,017 |  |
Intersegment revenues | 24 |  |  | 6 |  |  | — |  |  | 143 |  |  | — |  |  | (173) |  |  | — |  |
Revenue | 4,002 |  |  | 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), net | 135 |  |  | 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 expenditures | 1,873 |  |  | 483 |  |  | 225 |  |  | 505 |  |  | 6 |  |  | 26 |  |  | 3,118 |  |
Nine Months 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 2,980 |  |  | $ | 1,566 |  |  | $ | 660 |  |  | $ | 476 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,682 |  |
Intersegment revenues | 25 |  |  | 1 |  |  | — |  |  | 110 |  |  | — |  |  | (136) |  |  | — |  |
Revenue | 3,005 |  |  | 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), net | 144 |  |  | 72 |  |  | 20 |  |  | 14 |  |  | 54 |  |  | (11) |  |  | 293 |  |
Interest charges | (187) |  |  | (73) |  |  | (46) |  |  | (89) |  |  | (108) |  |  | 11 |  |  | (492) |  |
Income (taxes) benefit | 4 |  |  | (41) |  |  | (38) |  |  | (89) |  |  | 24 |  |  | — |  |  | (140) |  |
Noncontrolling interests – preferred stock dividends | (3) |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (4) |  |
Net income (loss) attributable to Ameren common shareholders | 534 |  |  | 173 |  |  | 102 |  |  | 241 |  | (b) | (75) |  |  | — |  |  | 975 |  |
Interest income | 7 |  |  | 21 |  |  | 1 |  |  | 1 |  |  | 10 |  |  | (11) |  |  | 29 |  |
Capital expenditures | 1,839 |  |  | 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 Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois
Three Months 2025: |  |  |  |  |  |  |  |  |
External revenues | $ | 699 |  |  | $ | 117 |  |  | $ | 130 |  |  | $ | — |  |  | $ | 946 |
Intersegment revenues | — |  |  | — |  |  | 46 |  |  | (46) |  |  | — |
Revenue | 699 |  |  | 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, net | 20 |  |  | 4 |  |  | 6 |  |  | — |  |  | 30 |
Interest charges | (28) |  |  | (16) |  |  | (23) |  |  | — |  |  | (67) |
Income taxes | (19) |  |  | 4 |  |  | (2) |  |  | — |  |  | (17) |
Net income (loss) available to common shareholder | 57 |  |  | (13) |  |  | 104 |  |  | — |  |  | 148 |
Interest income | 6 |  |  | — |  |  | 1 |  |  | — |  |  | 7 |
Capital expenditures | 163 |  |  | 78 |  |  | 144 |  |  | — |  |  | 385 |
Three Months 2024: |  |  |  |  |  |  |  |  |
External revenues | $ | 552 |  |  | $ | 121 |  |  | $ | 120 |  |  | $ | — |  |  | $ | 793 |
Intersegment revenues | — |  |  | — |  |  | 35 |  |  | (35) |  |  | — |
Revenue | 552 |  |  | 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, net | 23 |  |  | 6 |  |  | 8 |  |  | — |  |  | 37 |
Interest charges | (25) |  |  | (16) |  |  | (22) |  |  | — |  |  | (63) |
Income taxes | (14) |  |  | 2 |  |  | (25) |  |  | — |  |  | (37) |
Net income (loss) available to common shareholder | 56 |  |  | (10) |  |  | 68 |  |  | — |  |  | 114 |
Interest income | 6 |  |  | 1 |  |  | — |  |  | — |  |  | 7 |
Capital expenditures | 152 |  |  | 83 |  |  | 139 |  |  | — |  |  | 374 |
Nine Months 2025: |  |  |  |  |  |  |  |  |
External revenues | $ | 1,844 |  |  | $ | 686 |  |  | $ | 359 |  |  | $ | — |  |  | $ | 2,889 |
Intersegment revenues | — |  |  | — |  |  | 123 |  |  | (123) |  |  | — |
Revenue | 1,844 |  |  | 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, net | 66 |  |  | 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 expenditures | 483 |  |  | 225 |  |  | 419 |  |  | — |  |  | 1,127 |
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois
Nine Months 2024: |  |  |  |  |  |  |  |  |
External revenues | $ | 1,567 |  |  | $ | 660 |  |  | $ | 332 |  |  | $ | — |  |  | $ | 2,559 |
Intersegment revenues | — |  |  | — |  |  | 90 |  |  | (90) |  |  | — |
Revenue | 1,567 |  |  | 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, net | 72 |  |  | 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 shareholder | 173 |  |  | 102 |  |  | 178 |  |  | — |  |  | 453 |
Interest income | 21 |  |  | 1 |  |  | — |  |  | — |  |  | 22 |
Capital expenditures | 468 |  |  | 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 Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  |  |  | Intersegment Eliminations |  | Ameren |
Three Months 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 702 |  |  | $ | 469 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 1,171 |  |
Commercial | 537 |  |  | 235 |  |  | — |  |  | — |  |  |  |  | — |  |  | 772 |  |
Industrial | 119 |  |  | 46 |  |  | — |  |  | — |  |  |  |  | — |  |  | 165 |  |
Other | 327 |  |  | (51) |  | (a) | — |  |  | 240 |  |  |  |  | (61) |  |  | 455 |  |
Total electric revenues | $ | 1,685 |  |  | $ | 699 |  |  | $ | — |  |  | $ | 240 |  |  |  |  | $ | (61) |  |  | $ | 2,563 |  |
Residential | $ | 9 |  |  | $ | — |  |  | $ | 70 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 79 |  |
Commercial | 5 |  |  | — |  |  | 21 |  |  | — |  |  |  |  | — |  |  | 26 |  |
Industrial | — |  |  | — |  |  | 2 |  |  | — |  |  |  |  | — |  |  | 2 |  |
Other | 6 |  |  | — |  |  | 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 |  |
Commercial | 465 |  |  | 184 |  |  | — |  |  | — |  |  |  |  | — |  |  | 649 |  |
Industrial | 108 |  |  | 38 |  |  | — |  |  | — |  |  |  |  | — |  |  | 146 |  |
Other | 161 |  |  | (9) |  | (a) | — |  |  | 210 |  |  |  |  | (51) |  |  | 311 |  |
Total electric revenues | $ | 1,324 |  |  | $ | 552 |  |  | $ | — |  |  | $ | 210 |  |  |  |  | $ | (51) |  |  | $ | 2,035 |  |
Residential | $ | 9 |  |  | $ | — |  |  | $ | 77 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 86 |  |
Commercial | 5 |  |  | — |  |  | 19 |  |  | — |  |  |  |  | — |  |  | 24 |  |
Industrial | — |  |  | — |  |  | 2 |  |  | — |  |  |  |  | — |  |  | 2 |  |
Other | 4 |  |  | — |  |  | 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 |  |
Commercial | 1,154 |  |  | 596 |  |  | — |  |  | — |  |  |  |  | — |  |  | 1,750 |  |
Industrial | 269 |  |  | 144 |  |  | — |  |  | — |  |  |  |  | — |  |  | 413 |  |
Other | 987 |  |  | (28) |  | (a) | — |  |  | 658 |  |  |  |  | (172) |  |  | 1,445 |  |
Total electric revenues | $ | 3,893 |  |  | $ | 1,844 |  |  | $ | — |  |  | $ | 658 |  |  |  |  | $ | (172) |  |  | $ | 6,223 |  |
Residential | $ | 65 |  |  | $ | — |  |  | $ | 486 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 551 |  |
Commercial | 29 |  |  | — |  |  | 126 |  |  | — |  |  |  |  | — |  |  | 155 |  |
Industrial | 3 |  |  | — |  |  | 9 |  |  | — |  |  |  |  | — |  |  | 12 |  |
Other | 12 |  |  | — |  |  | 65 |  |  | — |  |  |  |  | (1) |  |  | 76 |  |
Total natural gas revenues | $ | 109 |  |  | $ | — |  |  | $ | 686 |  |  | $ | — |  |  |  |  | $ | (1) |  |  | $ | 794 |  |
Total revenues(b) | $ | 4,002 |  |  | $ | 1,844 |  |  | $ | 686 |  |  | $ | 658 |  |  |  |  | $ | (173) |  |  | $ | 7,017 |  |
| Ameren Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  |  |  | Intersegment Eliminations |  | Ameren |
Nine Months 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 1,326 |  |  | $ | 947 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 2,273 |  |
Commercial | 1,048 |  |  | 512 |  |  | — |  |  | — |  |  |  |  | — |  |  | 1,560 |  |
Industrial | 246 |  |  | 130 |  |  | — |  |  | — |  |  |  |  | — |  |  | 376 |  |
Other | 282 |  |  | (22) |  | (a) | — |  |  | 586 |  |  |  |  | (135) |  |  | 711 |  |
Total electric revenues | $ | 2,902 |  |  | $ | 1,567 |  |  | $ | — |  |  | $ | 586 |  |  |  |  | $ | (135) |  |  | $ | 4,920 |  |
Residential | $ | 62 |  |  | $ | — |  |  | $ | 466 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 528 |  |
Commercial | 26 |  |  | — |  |  | 111 |  |  | — |  |  |  |  | — |  |  | 137 |  |
Industrial | 3 |  |  | — |  |  | 7 |  |  | — |  |  |  |  | — |  |  | 10 |  |
Other | 12 |  |  | — |  |  | 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 Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  | Intersegment Eliminations |  | Ameren |
Three Months 2025: |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | — |  |  | $ | (187) |  |  | $ | (10) |  |  | $ | (12) |  |  | $ | — |  |  | $ | (209) |  |
Other revenues not from contracts with customers | 2 |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | 5 |  |
Three Months 2024: |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | — |  |  | $ | (144) |  |  | $ | (9) |  |  | $ | (2) |  |  | $ | — |  |  | $ | (155) |  |
Other revenues not from contracts with customers | 2 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 4 |  |
Nine Months 2025: |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (4) |  |  | $ | (174) |  |  | $ | (6) |  |  | $ | (21) |  |  | $ | — |  |  | $ | (205) |  |
Other revenues not from contracts with customers | 5 |  |  | 11 |  |  | 2 |  |  | — |  |  | (4) |  |  | 14 |  |
Nine Months 2024: |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (7) |  |  | $ | (83) |  |  | $ | 10 |  |  | $ | 11 |  |  | $ | — |  |  | $ | (69) |  |
Other revenues not from contracts with customers | 4 |  |  | 5 |  |  | 2 |  |  | — |  |  | — |  |  | 11 |  |
Ameren Illinois
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois |
Three Months 2025: |  |  |  |  |  |  |  |  |  |
Residential | $ | 469 |  |  | $ | 70 |  |  | $ | — |  |  | $ | — |  |  | $ | 539 |  |
Commercial | 235 |  |  | 21 |  |  | — |  |  | — |  |  | 256 |  |
Industrial | 46 |  |  | 2 |  |  | — |  |  | — |  |  | 48 |  |
Other | (51) |  | (a) | 24 |  |  | 176 |  |  | (46) |  |  | 103 |  |
Total revenues(b) | $ | 699 |  |  | $ | 117 |  |  | $ | 176 |  |  | $ | (46) |  |  | $ | 946 |  |
Three Months 2024: |  |  |  |  |  |  |  |  |  |
Residential | $ | 339 |  |  | $ | 77 |  |  | $ | — |  |  | $ | — |  |  | $ | 416 |  |
Commercial | 184 |  |  | 19 |  |  | — |  |  | — |  |  | 203 |  |
Industrial | 38 |  |  | 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 |  |
Commercial | 596 |  |  | 126 |  |  | — |  |  | — |  |  | 722 |  |
Industrial | 144 |  |  | 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 |  |
Commercial | 512 |  |  | 111 |  |  | — |  |  | — |  |  | 623 |  |
Industrial | 130 |  |  | 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 Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Ameren Illinois
Three Months 2025: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (187) |  |  | $ | (10) |  |  | $ | (12) |  |  | $ | (209) |
Other revenues not from contracts with customers | 3 |  |  | — |  |  | — |  |  | 3 |
Three Months 2024: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (144) |  |  | $ | (9) |  |  | $ | (1) |  |  | $ | (154) |
Other revenues not from contracts with customers | 2 |  |  | — |  |  | — |  |  | 2 |
Nine Months 2025: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (174) |  |  | $ | (6) |  |  | $ | (20) |  |  | $ | (200) |
Other revenues not from contracts with customers | 11 |  |  | 2 |  |  | — |  |  | 13 |
Nine Months 2024: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (83) |  |  | $ | 10 |  |  | $ | 9 |  |  | $ | (64) |
Other revenues not from contracts with customers | 5 |  |  | 2 |  |  | — |  |  | 7 |

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