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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Schedule Of Segment Reporting Information, By Segment
The following tables present information about the reported revenue and specified items reflected in net income attributable to common shareholders and capital expenditures by segment at Ameren and Ameren Illinois for the years ended December 31, 2023, 2022, and 2021. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
2023
External revenues$3,825 $2,217 $897 $561 $— $— $7,500 
Intersegment revenues34 1 — 116 — (151)— 
Depreciation and amortization783 351 108 138 7 — 1,387 
Interest income11 19 1 2 5 (5)33 
Interest charges227 89 55 96 
(a)
104 (5)566 
Income taxes (benefit)(8)82 50 106 (47)— 183 
Net income (loss) attributable to Ameren common shareholders545 258 134 296 (81)— 1,152 
Capital expenditures1,760 752 299 804 9 (27)3,597 
2022
External revenues$4,012 $2,255 $1,180 $510 $— $— $7,957 
Intersegment revenues34 1 — 105 — (140)— 
Depreciation and amortization732 332 98 123 4 — 1,289 
Interest income28 7 — — 1 (1)35 
Interest charges213 74 44 84 
(a)
72 (1)486 
Income taxes (benefit)(10)68 46 92 (20)— 176 
Net income (loss) attributable to Ameren common shareholders562 202 123 263 (76)— 1,074 
Capital expenditures1,690 621 308 741 7 (16)3,351 
2021
External revenues$3,311 $1,635 $957 $491 $— $— $6,394 
Intersegment revenues42 4 — 71 — (117)— 
Depreciation and amortization632 309 90 111 4 — 1,146 
Interest income26 1 — — 3 (3)27 
Interest charges137 74 42 83 
(a)
50 (3)383 
Income taxes (benefit)3 53 39 82 (20)— 157 
Net income (loss) attributable to Ameren common shareholders518 165 108 230 (31)— 990 
Capital expenditures2,015 579 278 616 4 (13)3,479 
(a)Ameren Transmission interest charges include an allocation of financing costs from Ameren (parent).
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois
Natural Gas		Ameren Illinois TransmissionIntersegment EliminationsAmeren Illinois
2023
External revenues$2,218 $897 $367 $— $3,482 
Intersegment revenues— — 113 (113)— 
Depreciation and amortization351 108 97 — 556 
Interest income19 1 1 — 21 
Interest charges89 55 60 — 204 
Income taxes82 50 77 — 209 
Net income available to common shareholder258 134 215 — 607 
Capital expenditures752 299 680 — 1,731 
2022
External revenues$2,256 $1,180 $320 $— $3,756 
Intersegment revenues— — 104 (104)— 
Depreciation and amortization332 98 84 — 514 
Interest income7 — — — 7 
Interest charges74 44 50 — 168 
Income taxes68 46 65 — 179 
Net income available to common shareholder202 123 188 — 513 
Capital expenditures621 308 672 — 1,601 
2021
External revenues$1,639 $957 $299 $— $2,895 
Intersegment revenues— — 66 (66)— 
Depreciation and amortization309 90 73 — 472 
Interest income1 — — — 1 
Interest charges74 42 48 — 164 
Income taxes53 39 51 — 143 
Net income available to common shareholder165 108 152 — 425 
Capital expenditures579 278 575 — 1,432 
Disaggregation of Revenue
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the years ended December 31, 2023, 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 sales and capacity revenues.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
2023
Residential$1,577 $1,344 $— $— $— $2,921 
Commercial1,280 747 — — — 2,027 
Industrial306 186 — — — 492 
Other531 (59)— 677 (150)999 
Total electric revenues$3,694 $2,218 $— $677 $(150)$6,439 
Residential$100 $— $657 $— $— $757 
Commercial46 — 164 — — 210 
Industrial5 — 14 — — 19 
Other14 — 62 — (1)75 
Total gas revenues$165 $— $897 $— $(1)$1,061 
Total revenues(a)
$3,859 $2,218 $897 $677 $(151)$7,500 
2022
Residential$1,578 $1,325 $— $— $— $2,903 
Commercial1,219 768 — — — 1,987 
Industrial290 199 — — — 489 
Other762 (36)— 615 (139)1,202 
Total electric revenues$3,849 $2,256 $— $615 $(139)$6,581 
Residential$119 $— $846 $— $— $965 
Commercial56 — 221 — — 277 
Industrial7 — 41 — — 48 
Other15 — 72 — (1)86 
Total gas revenues$197 $— $1,180 $— $(1)$1,376 
Total revenues(a)
$4,046 $2,256 $1,180 $615 $(140)$7,957 
2021
Residential$1,445 $933 $— $— $— $2,378 
Commercial1,126 545 — — — 1,671 
Industrial280 135 — — — 415 
Other361 26 — 562 (116)833 
Total electric revenues$3,212 $1,639 $— $562 $(116)$5,297 
Residential$79 $— $657 $— $— $736 
Commercial34 — 172 — — 206 
Industrial4 — 35 — — 39 
Other24 — 93 — (1)116 
Total gas revenues$141 $— $957 $— $(1)$1,097 
Total revenues(a)
$3,353 $1,639 $957 $562 $(117)$6,394 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the years ended December 31, 2023, 2022, and 2021:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
2023
Revenues from alternative revenue programs$(5)$116 $49 $19 $179 
Other revenues not from contracts with customers(9)
(a)
7 2 — — 
(a)
2022
Revenues from alternative revenue programs$17 $89 $(19)$(9)$78 
Other revenues not from contracts with customers(103)
(a)(b)
6 3 — (94)
(a)(b)
2021
Revenues from alternative revenue programs$(16)$77 $5 $11 $77 
Other revenues not from contracts with customers56 
(a)(b)
10 2 — 68 
(a)(b)
(a)Includes net realized gains and losses on derivative power contracts.
(b)Includes $10 million and $78 million for insurance recoveries related to lost sales associated with the Callaway Energy Center maintenance outage for the years ended December 31, 2022 and 2021, respectively.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
2023
Residential$1,344 $657 $— $— $2,001 
Commercial747 164 — — 911 
Industrial186 14 — — 200 
Other(59)62 480 (113)370 
Total revenues(a)
$2,218 $897 $480 $(113)$3,482 
2022
Residential$1,325 $846 $— $— $2,171 
Commercial768 221 — — 989 
Industrial199 41 — — 240 
Other(36)72 424 (104)356 
Total revenues(a)
$2,256 $1,180 $424 $(104)$3,756 
2021
Residential$933 $657 $— $— $1,590 
Commercial545 172 — — 717 
Industrial135 35 — — 170 
Other26 93 365 (66)418 
Total revenues(a)
$1,639 $957 $365 $(66)$2,895 
(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 years ended December 31, 2023, 2022, and 2021:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
2023
Revenues from alternative revenue programs$116 $49 $12 $177 
Other revenues not from contracts with customers7 2 — 9 
2022
Revenues from alternative revenue programs$89 $(19)$(7)$63 
Other revenues not from contracts with customers6 3 — 9 
2021
Revenues from alternative revenue programs$77 $5 $9 $91 
Other revenues not from contracts with customers10 2 — 12