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Segment Information
 9 Months Ended
Sep. 30, 2023
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, 2023 and 2022. 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 MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
Three Months 2023:
External revenues$1,228 $557 $121 $154 $— $— $2,060 
Intersegment revenues9 1 1 34 — (45)— 
Net income (loss) attributable to Ameren common shareholders411 66 (5)86 
(a)
(65)— 493 
Capital expenditures341 177 80 160 2 (11)749 
Three Months 2022:
External revenues$1,351 $672 $146 $137 $— $— $2,306 
Intersegment revenues8 — — 32 — (40)— 
Net income (loss) attributable to Ameren common shareholders397 51 (4)78 
(a)
(70)— 452 
Capital expenditures431 163 114 187 1 3 899 
Nine Months 2023:
External revenues$3,074 $1,721 $664 $423 $— $— $5,882 
Intersegment revenues27 1 1 89 — (118)— 
Net income (loss) attributable to Ameren common shareholders541 193 93 229 
(a)
(62)— 994 
Capital expenditures1,255 527 221 570 7 (9)2,571 
Nine Months 2022:
External revenues$3,071 $1,640 $811 $389 $— $— $5,911 
Intersegment revenues25 1 — 76 — (102)— 
Net income (loss) attributable to Ameren common shareholders547 151 82 199 
(a)
(68)— 911 
Capital expenditures1,237 444 232 519 4 1 2,437 
(a)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent).
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2023:
External revenues$558 $122 $103 $— $783 
Intersegment revenues— — 33 (33)— 
Net income (loss) available to common shareholder66 (5)64 — 125 
Capital expenditures177 80 125 — 382 
Three Months 2022:
External revenues$672 $146 $86 $— $904 
Intersegment revenues— — 31 (31)— 
Net income (loss) available to common shareholder51 (4)56 — 103 
Capital expenditures163 114 169 — 446 
Nine Months 2023:
External revenues$1,722 $665 $276 $— $2,663 
Intersegment revenues— — 87 (87)— 
Net income available to common shareholder193 93 166 — 452 
Capital expenditures527 221 478 — 1,226 
Nine Months 2022:
External revenues$1,641 $811 $245 $— $2,697 
Intersegment revenues— — 75 (75)— 
Net income available to common shareholder151 82 142 — 375 
Capital expenditures444 232 469 — 1,145 
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2023 and 2022. 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 2023:
Residential$590 $330 $— $— $— $920 
Commercial468 189 — — — 657 
Industrial107 40 — — — 147 
Other54 (1)
(a)
— 188 (44)197 
Total electric revenues$1,219 $558 $— $188 $(44)$1,921 
Residential$9 $— $75 $— $— $84 
Commercial5 — 19 — — 24 
Industrial1 — 1 — — 2 
Other3 — 27 

— (1)29 
Total natural gas revenues$18 $— $122 $— $(1)$139 
Total revenues(b)
$1,237 $558 $122 $188 $(45)$2,060 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2022:
Residential$564 $407 $— $— $— $971 
Commercial430 233 — — — 663 
Industrial99 47 — — — 146 
Other245 

(15)
(a)
— 169 (39)360 

Total electric revenues$1,338 $672 $— $169 $(39)$2,140 
Residential$11 $— $89 $— $— $100 
Commercial6 — 25 — — 31 
Industrial1 — 5 — — 6 
Other3 — 27 — (1)29 
Total natural gas revenues$21 $— $146 $— $(1)$166 
Total revenues(b)
$1,359 $672 $146 $169 $(40)$2,306 
Nine Months 2023:
Residential$1,274 $1,049 $— $— $— $2,323 
Commercial1,026 582 — — — 1,608 
Industrial243 136 — — — 379 
Other435 (45)
(a)
— 512 (116)786 
Total electric revenues$2,978 $1,722 $— $512 $(116)$5,096 
Residential$74 $— $469 $— $— $543 
Commercial34 — 121 — — 155 
Industrial4 — 10 — — 14 
Other11 — 65 — (2)74 
Total natural gas revenues$123 $— $665 $— $(2)$786 
Total revenues(b)
$3,101 $1,722 $665 $512 $(118)$5,882 
Nine Months 2022:
Residential$1,267 $954 $— $— $— $2,221 
Commercial968 571 — — — 1,539 
Industrial229 145 — — — 374 
Other502 (29)
(a)
— 465 (101)837 
Total electric revenues$2,966 $1,641 $— $465 $(101)$4,971 
Residential$78 $— $575 $— $— $653 
Commercial36 — 152 — — 188 
Industrial4 — 33 — — 37 
Other12 — 51 — (1)62 
Total natural gas revenues$130 $— $811 $— $(1)$940 
Total revenues(b)
$3,096 $1,641 $811 $465 $(102)$5,911 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 30, 2023 and 2022:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2023:
Revenues from alternative revenue programs$(9)$(94)$(1)$(5)$(109)
Other revenues not from contracts with customers(1)
(a)
2 — — 1 
(a)
Three Months 2022:
Revenues from alternative revenue programs$14 $(83)$(3)$(11)$(83)
Other revenues not from contracts with customers(45)
(a)
2 — — (43)
(a)
Nine Months 2023:
Revenues from alternative revenue programs$(11)$30 $36 $8 $63 
Other revenues not from contracts with customers(9)
(a)
6 2 — (1)
(a)
Nine Months 2022:
Revenues from alternative revenue programs$8 $13 $(5)$(14)$2 
Other revenues not from contracts with customers(81)
(a), (b)
5 2 — (74)
(a), (b)
(a)Includes net realized losses on derivative power contracts.
(b)Includes insurance recoveries related to lost sales associated with the December 2020 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 DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2023:
Residential$330 $75 $— $— $405 
Commercial189 19 — — 208 
Industrial40 1 — — 41 
Other(1)
(a)
27 

136 (33)129 
Total revenues(b)
$558 $122 $136 $(33)$783 
Three Months 2022:
Residential$407 $89 $— $— $496 
Commercial233 25 — — 258 
Industrial47 5 — — 52 
Other(15)
(a)
27 117 (31)98 
Total revenues(b)
$672 $146 $117 $(31)$904 
Nine Months 2023:
Residential$1,049 $469 $— $— $1,518 
Commercial582 121 — — 703 
Industrial136 10 — — 146 
Other(45)
(a)
65 363 (87)296 
Total revenues(b)
$1,722 $665 $363 $(87)$2,663 
Nine Months 2022:
Residential$954 $575 $— $— $1,529 
Commercial571 152 — — 723 
Industrial145 33 — — 178 
Other(29)
(a)
51 320 (75)267 
Total revenues(b)
$1,641 $811 $320 $(75)$2,697 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2023 and 2022:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2023:
Revenues from alternative revenue programs$(94)$(1)$(6)$(101)
Other revenues not from contracts with customers2 — — 2 
Three Months 2022:
Revenues from alternative revenue programs$(83)$(3)$(10)$(96)
Other revenues not from contracts with customers2 — — 2 
Nine Months 2023:
Revenues from alternative revenue programs$30 $36 $4 $70 
Other revenues not from contracts with customers6 2 — 8 
Nine Months 2022:
Revenues from alternative revenue programs$13 $(5)$(12)$(4)
Other revenues not from contracts with customers5 2 — 7