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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2023
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, 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$933 $540 $152 $135 $— $— $1,760 
Intersegment revenues8 — — 26 — (34)— 
Net income (loss) attributable to Ameren common shareholders102 66 11 72 
(a)
(14)— 237 
Capital expenditures433 180 90 197 2 (11)891 
Three Months 2022:
External revenues$912 $504 $184 $126 $— $— $1,726 
Intersegment revenues7 — — 24 — (31)— 
Net income (loss) attributable to Ameren common shareholders100 51 6 63 
(a)
(13)— 207 
Capital expenditures392 143 69 160 1 (1)764 
Six Months 2023:
External revenues$1,846 $1,164 $543 $269 $— $— $3,822 
Intersegment revenues18 — — 55 — (73)— 
Net income attributable to Ameren common shareholders130 127 98 143 
(a)
3 — 501 
Capital expenditures914 350 141 410 5 2 1,822 
Six Months 2022:
External revenues$1,720 $968 $665 $252 $— $— $3,605 
Intersegment revenues17 1 — 44 — (62)— 
Net income attributable to Ameren common shareholders150 100 86 121 
(a)
2 — 459 
Capital expenditures806 281 118 332 3 (2)1,538 
(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$540 $152 $87 $— $779 
Intersegment revenues— — 26 (26)— 
Net income available to common shareholder66 11 52 — 129 
Capital expenditures180 90 167 — 437 
Three Months 2022:
External revenues$504 $184 $81 $— $769 
Intersegment revenues— — 24 (24)— 
Net income available to common shareholder51 6 46 — 103 
Capital expenditures143 69 145 — 357 
Six Months 2023:
External revenues$1,164 $543 $173 $— $1,880 
Intersegment revenues— — 54 (54)— 
Net income available to common shareholder127 98 102 — 327 
Capital expenditures350 141 353 — 844 
Six Months 2022:
External revenues$969 $665 $159 $— $1,793 
Intersegment revenues— — 44 (44)— 
Net income available to common shareholder100 86 86 — 272 
Capital expenditures281 118 300 — 699 
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, 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$360 $337 $— $— $— $697 
Commercial311 193 — — — 504 
Industrial75 48 — — — 123 
Other172 (38)
(a)
— 161 (34)261 
Total electric revenues$918 $540 $— $161 $(34)$1,585 
Residential$13 $— $98 $— $— $111 
Commercial6 — 25 — — 31 
Industrial1 — 2 — — 3 
Other3 — 27 

— — 30 
Total natural gas revenues$23 $— $152 $— $— $175 
Total revenues(b)
$941 $540 $152 $161 $(34)$1,760 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2022:
Residential$371 $284 $— $— $— $655 
Commercial298 180 — — — 478 
Industrial73 53 — — — 126 
Other148 

(13)
(a)
— 150 (31)254 

Total electric revenues$890 $504 $— $150 $(31)$1,513 
Residential$16 $— $117 $— $— $133 
Commercial8 — 30 — — 38 
Industrial1 — 11 — — 12 
Other4 — 26 — — 30 
Total natural gas revenues$29 $— $184 $— $— $213 
Total revenues(b)
$919 $504 $184 $150 $(31)$1,726 
Six Months 2023:
Residential$684 $719 $— $— $— $1,403 
Commercial558 393 — — — 951 
Industrial136 96 — — — 232 
Other381 (44)
(a)
— 324 (72)589 
Total electric revenues$1,759 $1,164 $— $324 $(72)$3,175 
Residential$65 $— $394 $— $— $459 
Commercial29 — 102 — — 131 
Industrial3 — 9 — — 12 
Other8 — 38 — (1)45 
Total natural gas revenues$105 $— $543 $— $(1)$647 
Total revenues(b)
$1,864 $1,164 $543 $324 $(73)$3,822 
Six Months 2022:
Residential$703 $547 $— $— $— $1,250 
Commercial538 338 — — — 876 
Industrial130 98 — — — 228 
Other257 (14)
(a)
— 296 (62)477 
Total electric revenues$1,628 $969 $— $296 $(62)$2,831 
Residential$67 $— $486 $— $— $553 
Commercial30 — 127 — — 157 
Industrial3 — 28 — — 31 
Other9 — 24 — — 33 
Total natural gas revenues$109 $— $665 $— $— $774 
Total revenues(b)
$1,737 $969 $665 $296 $(62)$3,605 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2023 and 2022:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2023:
Revenues from alternative revenue programs$— $60 $9 $5 $74 
Other revenues not from contracts with customers(2)
(a)
2 1 — 1 
(a)
Three Months 2022:
Revenues from alternative revenue programs$— $41 $3 $(4)$40 
Other revenues not from contracts with customers(36)
(a)
1 1 — (34)
(a)
Six Months 2023:
Revenues from alternative revenue programs$(2)$124 $37 $13 $172 
Other revenues not from contracts with customers(8)
(a)
4 2 — (2)
(a)
Six Months 2022:
Revenues from alternative revenue programs$(6)$96 $(2)$(3)$85 
Other revenues not from contracts with customers(36)
(a)
3 2 — (31)
(a)
(a)Includes net realized losses on derivative power contracts.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2023:
Residential$337 $98 $— $— $435 
Commercial193 25 — — 218 
Industrial48 2 — — 50 
Other(38)
(a)
27 

113 (26)76 
Total revenues(b)
$540 $152 $113 $(26)$779 
Three Months 2022:
Residential$284 $117 $— $— $401 
Commercial180 30 — — 210 
Industrial53 11 — — 64 
Other(13)
(a)
26 105 (24)94 
Total revenues(b)
$504 $184 $105 $(24)$769 
Six Months 2023:
Residential$719 $394 $— $— $1,113 
Commercial393 102 — — 495 
Industrial96 9 — — 105 
Other(44)
(a)
38 227 (54)167 
Total revenues(b)
$1,164 $543 $227 $(54)$1,880 
Six Months 2022:
Residential$547 $486 $— $— $1,033 
Commercial338 127 — — 465 
Industrial98 28 — — 126 
Other(14)
(a)
24 203 (44)169 
Total revenues(b)
$969 $665 $203 $(44)$1,793 
(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 six months ended June 30, 2023 and 2022:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2023:
Revenues from alternative revenue programs$60 $9 $3 $72 
Other revenues not from contracts with customers2 1 — 3 
Three Months 2022:
Revenues from alternative revenue programs$41 $3 $(3)$41 
Other revenues not from contracts with customers1 1 — 2 
Six Months 2023:
Revenues from alternative revenue programs$124 $37 $10 $171 
Other revenues not from contracts with customers4 2 — 6 
Six Months 2022:
Revenues from alternative revenue programs$96 $(2)$(2)$92 
Other revenues not from contracts with customers3 2 — 5