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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2022
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 and six months ended June 30, 2022 and 2021. 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 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 912 |  |  | $ | 504 |  |  | $ | 184 |  |  | $ | 126 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,726 |  |
Intersegment revenues | 7 |  |  | — |  |  | — |  |  | 24 |  |  | — |  |  | (31) |  |  | — |  |
Net income (loss) attributable to Ameren common shareholders | 100 |  |  | 51 |  |  | 6 |  |  | 63 |  | (a) | (13) |  |  | — |  |  | 207 |  |
Capital expenditures | 392 |  |  | 143 |  |  | 69 |  |  | 160 |  |  | 1 |  |  | (1) |  |  | 764 |  |
Three Months 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 799 |  |  | $ | 386 |  |  | $ | 168 |  |  | $ | 119 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,472 |  |
Intersegment revenues | 10 |  |  | 2 |  |  | — |  |  | 17 |  |  | — |  |  | (29) |  |  | — |  |
Net income (loss) attributable to Ameren common shareholders | 111 |  |  | 41 |  |  | 8 |  |  | 55 |  | (a) | (8) |  |  | — |  |  | 207 |  |
Capital expenditures | 567 |  | (b) | 129 |  |  | 61 |  |  | 131 |  |  | — |  |  | (12) |  |  | 876 |  | (b)
Six Months 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 1,720 |  |  | $ | 968 |  |  | $ | 665 |  |  | $ | 252 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,605 |  |
Intersegment revenues | 17 |  |  | 1 |  |  | — |  |  | 44 |  |  | — |  |  | (62) |  |  | — |  |
Net income attributable to Ameren common shareholders | 150 |  |  | 100 |  |  | 86 |  |  | 121 |  | (a) | 2 |  |  | — |  |  | 459 |  |
Capital expenditures | 806 |  |  | 281 |  |  | 118 |  |  | 332 |  |  | 3 |  |  | (2) |  |  | 1,538 |  |
Six Months 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues | $ | 1,494 |  |  | $ | 797 |  |  | $ | 515 |  |  | $ | 232 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,038 |  |
Intersegment revenues | 19 |  |  | 2 |  |  | — |  |  | 34 |  |  | — |  |  | (55) |  |  | — |  |
Net income attributable to Ameren common shareholders | 158 |  |  | 87 |  |  | 83 |  |  | 102 |  | (a) | 10 |  |  | — |  |  | 440 |  |
Capital expenditures | 1,101 |  | (b) | 286 |  |  | 109 |  |  | 272 |  |  | 1 |  |  | (6) |  |  | 1,763 |  | (b)
(a)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent). (b)Includes $224 million and $417 million at Ameren and Ameren Missouri for wind generation expenditures for the three and six months ended June 30, 2021, respectively. Ameren Illinois
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois
Three Months 2022: |  |  |  |  |  |  |  |  |
External revenues | $ | 504 |  |  | $ | 184 |  |  | $ | 81 |  |  | $ | — |  |  | $ | 769 |
Intersegment revenues | — |  |  | — |  |  | 24 |  |  | (24) |  |  | — |
Net income available to common shareholder | 51 |  |  | 6 |  |  | 46 |  |  | — |  |  | 103 |
Capital expenditures | 143 |  |  | 69 |  |  | 145 |  |  | — |  |  | 357 |
Three Months 2021: |  |  |  |  |  |  |  |  |
External revenues | $ | 388 |  |  | $ | 168 |  |  | $ | 73 |  |  | $ | — |  |  | $ | 629 |
Intersegment revenues | — |  |  | — |  |  | 15 |  |  | (15) |  |  | — |
Net income available to common shareholder | 41 |  |  | 8 |  |  | 37 |  |  | — |  |  | 86 |
Capital expenditures | 129 |  |  | 61 |  |  | 119 |  |  | — |  |  | 309 |
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois
Six Months 2022: |  |  |  |  |  |  |  |  |
External revenues | $ | 969 |  |  | $ | 665 |  |  | $ | 159 |  |  | $ | — |  |  | $ | 1,793 |
Intersegment revenues | — |  |  | — |  |  | 44 |  |  | (44) |  |  | — |
Net income available to common shareholder | 100 |  |  | 86 |  |  | 86 |  |  | — |  |  | 272 |
Capital expenditures | 281 |  |  | 118 |  |  | 300 |  |  | — |  |  | 699 |
Six Months 2021: |  |  |  |  |  |  |  |  |
External revenues | $ | 799 |  |  | $ | 515 |  |  | $ | 138 |  |  | $ | — |  |  | $ | 1,452 |
Intersegment revenues | — |  |  | — |  |  | 31 |  |  | (31) |  |  | — |
Net income available to common shareholder | 87 |  |  | 83 |  |  | 65 |  |  | — |  |  | 235 |
Capital expenditures | 286 |  |  | 109 |  |  | 251 |  |  | — |  |  | 646 |
Disaggregation of Revenue | The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and six months ended June 30, 2022 and 2021. 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 revenues. Ameren
| Ameren Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  |  |  | Intersegment Eliminations |  | Ameren |
Three Months 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 371 |  |  | $ | 284 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 655 |  |
Commercial | 298 |  |  | 180 |  |  | — |  |  | — |  |  |  |  | — |  |  | 478 |  |
Industrial | 73 |  |  | 53 |  |  | — |  |  | — |  |  |  |  | — |  |  | 126 |  |
Other | 148 |  |  | (13) |  |  | — |  |  | 150 |  |  |  |  | (31) |  |  | 254 |  |
Total electric revenues | $ | 890 |  |  | $ | 504 |  |  | $ | — |  |  | $ | 150 |  |  |  |  | $ | (31) |  |  | $ | 1,513 |  |
Residential | $ | 16 |  |  | $ | — |  |  | $ | 117 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 133 |  |
Commercial | 8 |  |  | — |  |  | 30 |  |  | — |  |  |  |  | — |  |  | 38 |  |
Industrial | 1 |  |  | — |  |  | 11 |  |  | — |  |  |  |  | — |  |  | 12 |  |
Other | 4 |  |  | — |  |  | 26 |  |  | — |  |  |  |  | — |  |  | 30 |  |
Total natural gas revenues | $ | 29 |  |  | $ | — |  |  | $ | 184 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 213 |  |
Total revenues(a) | $ | 919 |  |  | $ | 504 |  |  | $ | 184 |  |  | $ | 150 |  |  |  |  | $ | (31) |  |  | $ | 1,726 |  |
Three Months 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 328 |  |  | $ | 218 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 546 |  |
Commercial | 271 |  |  | 127 |  |  | — |  |  | — |  |  |  |  | — |  |  | 398 |  |
Industrial | 71 |  |  | 34 |  |  | — |  |  | — |  |  |  |  | — |  |  | 105 |  |
Other | 119 |  |  | 9 |  |  | — |  |  | 136 |  |  |  |  | (29) |  |  | 235 |  |
Total electric revenues | $ | 789 |  |  | $ | 388 |  |  | $ | — |  |  | $ | 136 |  |  |  |  | $ | (29) |  |  | $ | 1,284 |  |
Residential | $ | 11 |  |  | $ | — |  |  | $ | 112 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 123 |  |
Commercial | 4 |  |  | — |  |  | 29 |  |  | — |  |  |  |  | — |  |  | 33 |  |
Industrial | 1 |  |  | — |  |  | 3 |  |  | — |  |  |  |  | — |  |  | 4 |  |
Other | 4 |  |  | — |  |  | 24 |  |  | — |  |  |  |  | — |  |  | 28 |  |
Total natural gas revenues | $ | 20 |  |  | $ | — |  |  | $ | 168 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 188 |  |
Total revenues(a) | $ | 809 |  |  | $ | 388 |  |  | $ | 168 |  |  | $ | 136 |  |  |  |  | $ | (29) |  |  | $ | 1,472 |  |
| Ameren Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  |  |  | Intersegment Eliminations |  | Ameren |
Six Months 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 703 |  |  | $ | 547 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 1,250 |  |
Commercial | 538 |  |  | 338 |  |  | — |  |  | — |  |  |  |  | — |  |  | 876 |  |
Industrial | 130 |  |  | 98 |  |  | — |  |  | — |  |  |  |  | — |  |  | 228 |  |
Other | 257 |  |  | (14) |  |  | — |  |  | 296 |  |  |  |  | (62) |  |  | 477 |  |
Total electric revenues | $ | 1,628 |  |  | $ | 969 |  |  | $ | — |  |  | $ | 296 |  |  |  |  | $ | (62) |  |  | $ | 2,831 |  |
Residential | $ | 67 |  |  | $ | — |  |  | $ | 486 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 553 |  |
Commercial | 30 |  |  | — |  |  | 127 |  |  | — |  |  |  |  | — |  |  | 157 |  |
Industrial | 3 |  |  | — |  |  | 28 |  |  | — |  |  |  |  | — |  |  | 31 |  |
Other | 9 |  |  | — |  |  | 24 |  |  | — |  |  |  |  | — |  |  | 33 |  |
Total natural gas revenues | $ | 109 |  |  | $ | — |  |  | $ | 665 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 774 |  |
Total revenues(a) | $ | 1,737 |  |  | $ | 969 |  |  | $ | 665 |  |  | $ | 296 |  |  |  |  | $ | (62) |  |  | $ | 3,605 |  |
Six Months 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 640 |  |  | $ | 447 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 1,087 |  |
Commercial | 487 |  |  | 259 |  |  | — |  |  | — |  |  |  |  | — |  |  | 746 |  |
Industrial | 123 |  |  | 68 |  |  | — |  |  | — |  |  |  |  | — |  |  | 191 |  |
Other | 180 |  |  | 25 |  |  | — |  |  | 266 |  |  |  |  | (55) |  |  | 416 |  |
Total electric revenues | $ | 1,430 |  |  | $ | 799 |  |  | $ | — |  |  | $ | 266 |  |  |  |  | $ | (55) |  |  | $ | 2,440 |  |
Residential | $ | 45 |  |  | $ | — |  |  | $ | 363 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 408 |  |
Commercial | 19 |  |  | — |  |  | 93 |  |  | — |  |  |  |  | — |  |  | 112 |  |
Industrial | 2 |  |  | — |  |  | 17 |  |  | — |  |  |  |  | — |  |  | 19 |  |
Other | 17 |  |  | — |  |  | 42 |  |  | — |  |  |  |  | — |  |  | 59 |  |
Total natural gas revenues | $ | 83 |  |  | $ | — |  |  | $ | 515 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 598 |  |
Total revenues(a) | $ | 1,513 |  |  | $ | 799 |  |  | $ | 515 |  |  | $ | 266 |  |  |  |  | $ | (55) |  |  | $ | 3,038 |  |
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2022 and 2021:
| Ameren Missouri |  | Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Transmission |  | Ameren |
Three Months 2022: |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | — |  |  | $ | 41 |  |  | $ | 3 |  |  | $ | (4) |  |  | $ | 40 |  |
Other revenues not from contracts with customers | (36) |  |  | 1 |  |  | 1 |  |  | — |  |  | (34) |  |
Three Months 2021: |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (5) |  |  | $ | 34 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 36 |  |
Other revenues not from contracts with customers | 66 |  | (a) | — |  |  | 1 |  |  | — |  |  | 67 |  | (a)
Six Months 2022: |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (6) |  |  | $ | 96 |  |  | $ | (2) |  |  | $ | (3) |  |  | $ | 85 |  |
Other revenues not from contracts with customers | (36) |  | (a) | 3 |  |  | 2 |  |  | — |  |  | (31) |  | (a)
Six Months 2021: |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | (15) |  |  | $ | 95 |  |  | $ | 5 |  |  | $ | 4 |  |  | $ | 89 |  |
Other revenues not from contracts with customers | 64 |  | (a) | 3 |  |  | 2 |  |  | — |  |  | 69 |  | (a)
(a)Includes insurance recoveries related to lost sales associated with the Callaway Energy Center maintenance outage. See Note 9 – Callaway Energy Center under Part II, Item 8, of the Form 10-K for additional information. Ameren Illinois
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Intersegment Eliminations |  | Ameren Illinois |
Three Months 2022: |  |  |  |  |  |  |  |  |  |
Residential | $ | 284 |  |  | $ | 117 |  |  | $ | — |  |  | $ | — |  |  | $ | 401 |  |
Commercial | 180 |  |  | 30 |  |  | — |  |  | — |  |  | 210 |  |
Industrial | 53 |  |  | 11 |  |  | — |  |  | — |  |  | 64 |  |
Other | (13) |  |  | 26 |  |  | 105 |  |  | (24) |  |  | 94 |  |
Total revenues(a) | $ | 504 |  |  | $ | 184 |  |  | $ | 105 |  |  | $ | (24) |  |  | $ | 769 |  |
Three Months 2021: |  |  |  |  |  |  |  |  |  |
Residential | $ | 218 |  |  | $ | 112 |  |  | $ | — |  |  | $ | — |  |  | $ | 330 |  |
Commercial | 127 |  |  | 29 |  |  | — |  |  | — |  |  | 156 |  |
Industrial | 34 |  |  | 3 |  |  | — |  |  | — |  |  | 37 |  |
Other | 9 |  |  | 24 |  |  | 88 |  |  | (15) |  |  | 106 |  |
Total revenues(a) | $ | 388 |  |  | $ | 168 |  |  | $ | 88 |  |  | $ | (15) |  |  | $ | 629 |  |
Six Months 2022: |  |  |  |  |  |  |  |  |  |
Residential | $ | 547 |  |  | $ | 486 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,033 |  |
Commercial | 338 |  |  | 127 |  |  | — |  |  | — |  |  | 465 |  |
Industrial | 98 |  |  | 28 |  |  | — |  |  | — |  |  | 126 |  |
Other | (14) |  |  | 24 |  |  | 203 |  |  | (44) |  |  | 169 |  |
Total revenues(a) | $ | 969 |  |  | $ | 665 |  |  | $ | 203 |  |  | $ | (44) |  |  | $ | 1,793 |  |
Six Months 2021: |  |  |  |  |  |  |  |  |  |
Residential | $ | 447 |  |  | $ | 363 |  |  | $ | — |  |  | $ | — |  |  | $ | 810 |  |
Commercial | 259 |  |  | 93 |  |  | — |  |  | — |  |  | 352 |  |
Industrial | 68 |  |  | 17 |  |  | — |  |  | — |  |  | 85 |  |
Other | 25 |  |  | 42 |  |  | 169 |  |  | (31) |  |  | 205 |  |
Total revenues(a) | $ | 799 |  |  | $ | 515 |  |  | $ | 169 |  |  | $ | (31) |  |  | $ | 1,452 |  |
(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 three and six months ended June 30, 2022 and 2021:
| Ameren Illinois Electric Distribution |  | Ameren Illinois Natural Gas |  | Ameren Illinois Transmission |  | Ameren Illinois
Three Months 2022: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | 41 |  |  | $ | 3 |  |  | $ | (3) |  |  | $ | 41 |
Other revenues not from contracts with customers | 1 |  |  | 1 |  |  | — |  |  | 2 |
Three Months 2021: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | 34 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 38 |
Other revenues not from contracts with customers | — |  |  | 1 |  |  | — |  |  | 1 |
Six Months 2022: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | 96 |  |  | $ | (2) |  |  | $ | (2) |  |  | $ | 92 |
Other revenues not from contracts with customers | 3 |  |  | 2 |  |  | — |  |  | 5 |
Six Months 2021: |  |  |  |  |  |  |
Revenues from alternative revenue programs | $ | 95 |  |  | $ | 5 |  |  | $ | 1 |  |  | $ | 101 |
Other revenues not from contracts with customers | 3 |  |  | 2 |  |  | — |  |  | 5 |

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