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Segment Information (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 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$799 $386 $168 $119 $— $— $1,472 
Intersegment revenues10 2 — 17 — (29)— 
Net income (loss) attributable to Ameren common shareholders111 41 8 55 
(a)
(8)— 207 
Capital expenditures567 
(b)
129 61 131 — (12)876 
(b)
Three Months 2020:
External revenues$782 $352 $140 $124 $— $— $1,398 
Intersegment revenues10 — — 12 — (22)— 
Net income (loss) attributable to Ameren common shareholders152 36 9 59 
(a)
(13)— 243 
Capital expenditures238 139 79 135 (1)2 592 
Six Months 2021:
External revenues$1,494 $797 $515 $232 $— $— $3,038 
Intersegment revenues19 2 — 34 — (55)— 
Net income attributable to Ameren common shareholders158 87 83 102 
(a)
10 — 440 
Capital expenditures1,101 
(b)
286 109 272 1 (6)1,763 
(b)
Six Months 2020:
External revenues$1,452 $741 $411 $234 $— $— $2,838 
Intersegment revenues20 1 — 25 — (46)— 
Net income attributable to Ameren common shareholders142 73 64 106 
(a)
4 — 389 
Capital expenditures516 262 140 305 2 3 1,228 
(a)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent).
(b)Includes $224 million and $417 million at Ameren and Ameren Missouri for wind generation expenditures for the three and six months ended June 30, 2021, respectively.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2021:
External revenues$388 $168 $73 $— $629 
Intersegment revenues— — 15 (15)— 
Net income available to common shareholder41 8 37 — 86 
Capital expenditures129 61 119 — 309 
Three Months 2020:
External revenues$352 $140 $75 $— $567 
Intersegment revenues— — 12 (12)— 
Net income available to common shareholder36 9 38 — 83 
Capital expenditures139 79 119 — 337 
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Six Months 2021:
External revenues$799 $515 $138 $— $1,452 
Intersegment revenues— — 31 (31)— 
Net income available to common shareholder87 83 65 — 235 
Capital expenditures286 109 251 — 646 
Six Months 2020:
External revenues$742 $411 $137 $— $1,290 
Intersegment revenues— — 24 (24)— 
Net income available to common shareholder73 64 66 — 203 
Capital expenditures262 140 259 — 661 
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, 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$328 $218 $— $— $— $546 
Commercial271 127 — — — 398 
Industrial71 34 — — — 105 
Other119 9 

— 136 (29)235 
Total electric revenues$789 $388 $— $136 $(29)$1,284 
Residential$11 $— $112 $— $— $123 
Commercial4 — 29 — — 33 
Industrial1 — 3 — — 4 
Other4 — 24 

— — 28 
Total natural gas revenues$20 $— $168 $— $— $188 
Total revenues(a)
$809 $388 $168 $136 $(29)$1,472 
Three Months 2020:
Residential$359 $210 $— $— $— $569 
Commercial264 112 — — — 376 
Industrial67 30 — — — 97 
Other81 

— — 136 (22)195 

Total electric revenues$771 $352 $— $136 $(22)$1,237 
Residential$11 $— $94 $— $— $105 
Commercial4 — 22 — — 26 
Industrial1 — 3 — — 4 
Other5 — 21 — — 26 
Total natural gas revenues$21 $— $140 $— $— $161 
Total revenues(a)
$792 $352 $140 $136 $(22)$1,398 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Six Months 2021:
Residential$640 $447 $— $— $— $1,087 
Commercial487 259 — — — 746 
Industrial123 68 — — — 191 
Other180 25 — 266 (55)416 
Total electric revenues$1,430 $799 $— $266 $(55)$2,440 
Residential$45 $— $363 $— $— $408 
Commercial19 — 93 — — 112 
Industrial2 — 17 — — 19 
Other17 — 42 — — 59 
Total natural gas revenues$83 $— $515 $— $— $598 
Total revenues(a)
$1,513 $799 $515 $266 $(55)$3,038 
Six Months 2020:
Residential$656 $430 $— $— $— $1,086 
Commercial485 238 — — — 723 
Industrial120 65 — — — 185 
Other141 9 — 259 (46)363 
Total electric revenues$1,402 $742 $— $259 $(46)$2,357 
Residential$44 $— $307 $— $— $351 
Commercial17 — 76 — — 93 
Industrial2 — 6 — — 8 
Other7 — 22 — — 29 
Total natural gas revenues$70 $— $411 $— $— $481 
Total revenues(a)
$1,472 $742 $411 $259 $(46)$2,838 
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2021 and 2020:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2021:
Revenues from alternative revenue programs$(5)$34 $2 $5 $36 
Other revenues not from contracts with customers66 
(a)
— 1 — 67 
(a)
Three Months 2020:
Revenues from alternative revenue programs$(6)$5 $3 $18 $20 
Other revenues not from contracts with customers7 — — — 7 
Six Months 2021:
Revenues from alternative revenue programs$(15)$95 $5 $4 $89 
Other revenues not from contracts with customers64 
(a)
3 2 — 69 
(a)
Six Months 2020:
Revenues from alternative revenue programs$(9)$51 $14 $30 $86 
Other revenues not from contracts with customers15 1 1 — 17 
(a)Includes insurance recoveries related to lost sales associated with the Callaway Energy Center maintenance outage. See Note 10 – Callaway Energy Center for additional information.
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2021:
Residential$218 $112 $— $— $330 
Commercial127 29 — — 156 
Industrial34 3 — — 37 
Other9 

24 

88 (15)106 
Total revenues(a)
$388 $168 $88 $(15)$629 
Three Months 2020:
Residential$210 $94 $— $— $304 
Commercial112 22 — — 134 
Industrial30 3 — — 33 
Other— 21 87 (12)96 
Total revenues(a)
$352 $140 $87 $(12)$567 
Six Months 2021:
Residential$447 $363 $— $— $810 
Commercial259 93 — — 352 
Industrial68 17 — — 85 
Other25 42 169 (31)205 
Total revenues(a)
$799 $515 $169 $(31)$1,452 
Six Months 2020:
Residential$430 $307 $— $— $737 
Commercial238 76 — — 314 
Industrial65 6 — — 71 
Other9 22 161 (24)168 
Total revenues(a)
$742 $411 $161 $(24)$1,290 
(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 six months ended June 30, 2021 and 2020:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2021:
Revenues from alternative revenue programs$34 $2 $2 $38 
Other revenues not from contracts with customers— 1 — 1 
Three Months 2020:
Revenues from alternative revenue programs$5 $3 $14 $22 
Other revenues not from contracts with customers— — — — 
Six Months 2021:
Revenues from alternative revenue programs$95 $5 $1 $101 
Other revenues not from contracts with customers3 2 — 5 
Six Months 2020:
Revenues from alternative revenue programs$51 $14 $24 $89 
Other revenues not from contracts with customers1 1 — 2