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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 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 Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  | Other |  | Intersegment Eliminations |  | Ameren |
Three Months 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 768 |  |  | $ | 506 |  |  | $ | 391 |  |  | $ | 151 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,816 |  |
Intersegment revenues | 7 |  |  | — |  |  | — |  |  | 34 |  |  | — |  |  | (41) |  |  | — |  |
Net income attributable to Ameren common shareholders | 25 |  |  | 56 |  |  | 106 |  |  | 72 |  | (a) | 2 |  |  | — |  |  | 261 |  |
Capital expenditures | 466 |  |  | 184 |  |  | 60 |  |  | 166 |  |  | 2 |  |  | 12 |  |  | 890 |  |
Three Months 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 913 |  |  | $ | 624 |  |  | $ | 391 |  |  | $ | 134 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,062 |  |
Intersegment revenues | 10 |  |  | — |  |  | — |  |  | 29 |  |  | — |  |  | (39) |  |  | — |  |
Net income attributable to Ameren common shareholders | 28 |  |  | 61 |  |  | 87 |  |  | 71 |  | (a) | 17 |  |  | — |  |  | 264 |  |
Capital expenditures | 481 |  |  | 170 |  |  | 51 |  |  | 213 |  |  | 3 |  |  | 13 |  |  | 931 |  |
(a)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 2024: |  |  |  |  |  |  |  |  |
External revenues | $ | 506 |  |  | $ | 391 |  |  | $ | 103 |  |  | $ | — |  |  | $ | 1,000 |
Intersegment revenues | — |  |  | — |  |  | 28 |  |  | (28) |  |  | — |
Net income available to common shareholder | 56 |  |  | 106 |  |  | 53 |  |  | — |  |  | 215 |
Capital expenditures | 184 |  |  | 60 |  |  | 129 |  |  | — |  |  | 373 |
Three Months 2023: |  |  |  |  |  |  |  |  |
External revenues | $ | 624 |  |  | $ | 391 |  |  | $ | 86 |  |  | $ | — |  |  | $ | 1,101 |
Intersegment revenues | — |  |  | — |  |  | 28 |  |  | (28) |  |  | — |
Net income available to common shareholder | 61 |  |  | 87 |  |  | 50 |  |  | — |  |  | 198 |
Capital expenditures | 170 |  |  | 51 |  |  | 186 |  |  | — |  |  | 407 |
Disaggregation of Revenue | The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three months ended March 31, 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 Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  |  |  | Intersegment Eliminations |  | Ameren |
Three Months 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 341 |  |  | $ | 297 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 638 |  |
Commercial | 259 |  |  | 165 |  |  | — |  |  | — |  |  |  |  | — |  |  | 424 |  |
Industrial | 61 |  |  | 45 |  |  | — |  |  | — |  |  |  |  | — |  |  | 106 |  |
Other | 53 |  |  | (1) |  | (a) | — |  |  | 185 |  |  |  |  | (41) |  |  | 196 |  |
Total electric revenues | $ | 714 |  |  | $ | 506 |  |  | $ | — |  |  | $ | 185 |  |  |  |  | $ | (41) |  |  | $ | 1,364 |  |
Residential | $ | 40 |  |  | $ | — |  |  | $ | 287 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 327 |  |
Commercial | 16 |  |  | — |  |  | 68 |  |  | — |  |  |  |  | — |  |  | 84 |  |
Industrial | 2 |  |  | — |  |  | 4 |  |  | — |  |  |  |  | — |  |  | 6 |  |
Other | 3 |  |  | — |  |  | 32 |  |  | — |  |  |  |  | — |  |  | 35 |  |
Total natural gas revenues | $ | 61 |  |  | $ | — |  |  | $ | 391 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 452 |  |
Total revenues(b) | $ | 775 |  |  | $ | 506 |  |  | $ | 391 |  |  | $ | 185 |  |  |  |  | $ | (41) |  |  | $ | 1,816 |  |
Three Months 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 324 |  |  | $ | 382 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 706 |  |
Commercial | 247 |  |  | 200 |  |  | — |  |  | — |  |  |  |  | — |  |  | 447 |  |
Industrial | 61 |  |  | 48 |  |  | — |  |  | — |  |  |  |  | — |  |  | 109 |  |
Other | 209 |  |  | (6) |  | (a) | — |  |  | 163 |  |  |  |  | (38) |  |  | 328 |  |
Total electric revenues | $ | 841 |  |  | $ | 624 |  |  | $ | — |  |  | $ | 163 |  |  |  |  | $ | (38) |  |  | $ | 1,590 |  |
Residential | $ | 52 |  |  | $ | — |  |  | $ | 296 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 348 |  |
Commercial | 23 |  |  | — |  |  | 77 |  |  | — |  |  |  |  | — |  |  | 100 |  |
Industrial | 2 |  |  | — |  |  | 7 |  |  | — |  |  |  |  | — |  |  | 9 |  |
Other | 5 |  |  | — |  |  | 11 |  |  | — |  |  |  |  | (1) |  |  | 15 |  |
Total natural gas revenues | $ | 82 |  |  | $ | — |  |  | $ | 391 |  |  | $ | — |  |  |  |  | $ | (1) |  |  | $ | 472 |  |
Total revenues(b) | $ | 923 |  |  | $ | 624 |  |  | $ | 391 |  |  | $ | 163 |  |  |  |  | $ | (39) |  |  | $ | 2,062 |  |
(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 months ended March 31, 2024 and 2023:
| Ameren Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  | Ameren |
Three Months 2024: |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (6) |  |  | $ | 39 |  |  | $ | 19 |  |  | $ | 9 |  |  | $ | 61 |  |
Other revenues not from contracts with customers | 1 |  |  | 2 |  |  | 1 |  |  | — |  |  | 4 |  |
Three Months 2023: |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (2) |  |  | $ | 64 |  |  | $ | 28 |  |  | $ | 8 |  |  | $ | 98 |  |
Other revenues not from contracts with customers | (6) |  | (a) | 2 |  |  | 1 |  |  | — |  |  | (3) |  | (a)
(a)Includes net realized losses on derivative power contracts. Ameren Illinois
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois |
Three Months 2024: |  |  |  |  |  |  |  |  |  |
Residential | $ | 297 |  |  | $ | 287 |  |  | $ | — |  |  | $ | — |  |  | $ | 584 |  |
Commercial | 165 |  |  | 68 |  |  | — |  |  | — |  |  | 233 |  |
Industrial | 45 |  |  | 4 |  |  | — |  |  | — |  |  | 49 |  |
Other | (1) |  | (a) | 32 |  |  | 131 |  |  | (28) |  |  | 134 |  |
Total revenues(b) | $ | 506 |  |  | $ | 391 |  |  | $ | 131 |  |  | $ | (28) |  |  | $ | 1,000 |  |
Three Months 2023: |  |  |  |  |  |  |  |  |  |
Residential | $ | 382 |  |  | $ | 296 |  |  | $ | — |  |  | $ | — |  |  | $ | 678 |  |
Commercial | 200 |  |  | 77 |  |  | — |  |  | — |  |  | 277 |  |
Industrial | 48 |  |  | 7 |  |  | — |  |  | — |  |  | 55 |  |
Other | (6) |  | (a) | 11 |  |  | 114 |  |  | (28) |  |  | 91 |  |
Total revenues(b) | $ | 624 |  |  | $ | 391 |  |  | $ | 114 |  |  | $ | (28) |  |  | $ | 1,101 |  |
(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 months ended March 31, 2024 and 2023:
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Ameren Illinois
Three Months 2024: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | 39 |  |  | $ | 19 |  |  | $ | 8 |  |  | $ | 66 |
Other revenues not from contracts with customers | 2 |  |  | 1 |  |  | — |  |  | 3 |
Three Months 2023: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | 64 |  |  | $ | 28 |  |  | $ | 7 |  |  | $ | 99 |
Other revenues not from contracts with customers | 2 |  |  | 1 |  |  | — |  |  | 3 |

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