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Segment Information (Tables)
 9 Months Ended
Sep. 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 nine months ended September 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 MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
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 
Three Months 2021:
External revenues$1,118 $425 $127 $141 $— $— $1,811 
Intersegment revenues11 3 — 19 — (33)— 
Net income (loss) attributable to Ameren common shareholders375 36 (8)73 
(a)
(51)— 425 
Capital expenditures466 
(b)
143 93 154 2 (8)850 
(b)
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 
Nine Months 2021:
External revenues$2,612 $1,222 $642 $373 $— $— $4,849 
Intersegment revenues30 5 — 53 — (88)— 
Net income (loss) attributable to Ameren common shareholders533 123 75 175 
(a)
(41)— 865 
Capital expenditures1,567 
(b)
429 202 426 3 (14)2,613 
(b)
(a)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent).
(b)Includes $98 million and $515 million at Ameren and Ameren Missouri for wind generation expenditures for the three and nine months ended September 30, 2021, respectively.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
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 
Three Months 2021:
External revenues$428 $127 $90 $— $645 
Intersegment revenues— — 18 (18)— 
Net income (loss) available to common shareholder36 (8)51 — 79 
Capital expenditures143 93 144 — 380 
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
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 
Nine Months 2021:
External revenues$1,227 $642 $228 $— $2,097 
Intersegment revenues— — 49 (49)— 
Net income available to common shareholder123 75 116 — 314 
Capital expenditures429 202 395 — 1,026 
Disaggregation of Revenue
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 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 MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2022:
Residential$564 $407 $— $— $— $971 
Commercial430 233 — — — 663 
Industrial99 47 — — — 146 
Other245 (15)

— 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(a)
$1,359 $672 $146 $169 $(40)$2,306 
Three Months 2021:
Residential$537 $258 $— $— $— $795 
Commercial412 143 — — — 555 
Industrial98 26 — — — 124 
Other66 

1 — 160 (33)194 

Total electric revenues$1,113 $428 $— $160 $(33)$1,668 
Residential$9 $— $75 $— $— $84 
Commercial4 — 23 — — 27 
Industrial— — 3 — — 3 
Other3 — 26 — — 29 
Total natural gas revenues$16 $— $127 $— $— $143 
Total revenues(a)
$1,129 $428 $127 $160 $(33)$1,811 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Nine Months 2022:
Residential$1,267 $954 $— $— $— $2,221 
Commercial968 571 — — — 1,539 
Industrial229 145 — — — 374 
Other502 (29)— 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(a)
$3,096 $1,641 $811 $465 $(102)$5,911 
Nine Months 2021:
Residential$1,177 $705 $— $— $— $1,882 
Commercial899 402 — — — 1,301 
Industrial221 94 — — — 315 
Other246 26 — 426 (88)610 
Total electric revenues$2,543 $1,227 $— $426 $(88)$4,108 
Residential$54 $— $438 $— $— $492 
Commercial23 — 116 — — 139 
Industrial2 — 20 — — 22 
Other20 — 68 — — 88 
Total natural gas revenues$99 $— $642 $— $— $741 
Total revenues(a)
$2,642 $1,227 $642 $426 $(88)$4,849 
(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 nine months ended September 30, 2022 and 2021:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
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)
Three Months 2021:
Revenues from alternative revenue programs$6 $(97)$(5)$1 $(95)
Other revenues not from contracts with customers7 
(b)
6 — — 13 
(b)
Nine Months 2022:
Revenues from alternative revenue programs$8 $13 $(5)$(14)$2 
Other revenues not from contracts with customers(81)
(a), (b)
5 2 — (74)
(a), (b)
Nine Months 2021:
Revenues from alternative revenue programs$(9)$(2)$— $5 $(6)
Other revenues not from contracts with customers71 
(b)
9 2 — 82 
(b)
(a)Includes net realized losses on derivative power contracts.
(b)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 DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2022:
Residential$407 $89 $— $— $496 
Commercial233 25 — — 258 
Industrial47 5 — — 52 
Other(15)

27 

117 (31)98 
Total revenues(a)
$672 $146 $117 $(31)$904 
Three Months 2021:
Residential$258 $75 $— $— $333 
Commercial143 23 — — 166 
Industrial26 3 — — 29 
Other1 26 108 (18)117 
Total revenues(a)
$428 $127 $108 $(18)$645 
Nine Months 2022:
Residential$954 $575 $— $— $1,529 
Commercial571 152 — — 723 
Industrial145 33 — — 178 
Other(29)51 320 (75)267 
Total revenues(a)
$1,641 $811 $320 $(75)$2,697 
Nine Months 2021:
Residential$705 $438 $— $— $1,143 
Commercial402 116 — — 518 
Industrial94 20 — — 114 
Other26 68 277 (49)322 
Total revenues(a)
$1,227 $642 $277 $(49)$2,097 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2022 and 2021:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2022:
Revenues from alternative revenue programs$(83)$(3)$(10)$(96)
Other revenues not from contracts with customers2 — — 2 
Three Months 2021:
Revenues from alternative revenue programs$(97)$(5)$3 $(99)
Other revenues not from contracts with customers6 — — 6 
Nine Months 2022:
Revenues from alternative revenue programs$13 $(5)$(12)$(4)
Other revenues not from contracts with customers5 2 — 7 
Nine Months 2021:
Revenues from alternative revenue programs$(2)$— $4 $2 
Other revenues not from contracts with customers9 2 — 11