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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Schedule Of Segment Reporting Information By Segment
The following tables present revenues, net income (loss) attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three months ended March 31, 2021 and 2020. 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 2021:
External revenues$695 $411 $347 $113 $— $— $1,566 
Intersegment revenues9 — — 17 — (26)— 
Net income attributable to Ameren common shareholders47 46 75 47 
(a)
18 — 233 
Capital expenditures534 
(b)
157 48 141 1 6 887 
(b)
Three Months 2020:
External revenues$670 $389 $271 $110 $— $— $1,440 
Intersegment revenues10 1 — 13 — (24)— 
Net income (loss) attributable to Ameren common shareholders(10)37 55 47 
(a)
17 — 146 
Capital expenditures278 123 61 170 3 1 636 
(a)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent).
(b)Includes $193 million at Ameren and Ameren Missouri for wind generation expenditures for the three months ended March 31, 2021.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2021:
External revenues$411 $347 $65 $— $823 
Intersegment revenues— — 16 (16)— 
Net income available to common shareholder46 75 28 — 149 
Capital expenditures157 48 132 — 337 
Three Months 2020:
External revenues$390 $271 $62 $— $723 
Intersegment revenues— — 12 (12)— 
Net income available to common shareholder37 55 28 — 120 
Capital expenditures123 61 140 — 324 
Disaggregation of Revenue
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three months ended March 31, 2021 and 2020. 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 2021:
Residential$312 $229 $— $— $— $541 
Commercial216 132 — — — 348 
Industrial52 34 — — — 86 
Other61 16 — 130 (26)181 
Total electric revenues$641 $411 $— $130 $(26)$1,156 
Residential$34 $— $251 $— $— $285 
Commercial15 — 64 — — 79 
Industrial1 — 14 — — 15 
Other13 — 18 — — 31 
Total natural gas revenues$63 $— $347 $— $— $410 
Total revenues(a)
$704 $411 $347 $130 $(26)$1,566 
Three Months 2020:
Residential$297 $220 $— $— $— $517 
Commercial221 126 — — — 347 
Industrial53 35 — — — 88 
Other60 9 — 123 (24)168 
Total electric revenues$631 $390 $— $123 $(24)$1,120 
Residential$33 $— $213 $— $— $246 
Commercial13 — 54 — — 67 
Industrial1 — 3 — — 4 
Other2 — 1 — — 3 
Total natural gas revenues$49 $— $271 $— $— $320 
Total revenues(a)
$680 $390 $271 $123 $(24)$1,440 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three months ended March 31, 2021 and 2020:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2021:
Revenues from alternative revenue programs$(10)$61 $3 $(1)$53 
Other revenues not from contracts with customers(2)3 1 — 2 
Three Months 2020:
Revenues from alternative revenue programs$(3)$46 $11 $12 $66 
Other revenues not from contracts with customers8 1 1 — 10 
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2021:
Residential$229 $251 $— $— $480 
Commercial132 64 — — 196 
Industrial34 14 — — 48 
Other16 18 81 (16)99 
Total revenues(a)
$411 $347 $81 $(16)$823 
Three Months 2020:
Residential$220 $213 $— $— $433 
Commercial126 54 — — 180 
Industrial35 3 — — 38 
Other9 1 74 (12)72 
Total revenues(a)
$390 $271 $74 $(12)$723 
(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 months ended March 31, 2021 and 2020:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2021:
Revenues from alternative revenue programs$61 $3 $(1)$63 
Other revenues not from contracts with customers3 1 — 4 
Three Months 2020:
Revenues from alternative revenue programs$46 $11 $10 $67 
Other revenues not from contracts with customers1 1 — 2