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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020 and 2019. 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 2020:
External revenues$782  $352  $140  $124  $—  $—  $1,398  
Intersegment revenues10  —  —  12  
(a)
—  (22) —  
Net income (loss) attributable to Ameren common shareholders152  36  9  59  
(b)
(13) —  243  
Capital expenditures238  139  79  135  (1) 2  592  
Three Months 2019:
External revenues$790  $358  $136  $95  $—  $—  $1,379  
Intersegment revenues8  1  —  14  
(a)
—  (23) —  
Net income (loss) attributable to Ameren common shareholders107  37  1  42  
(b)
(8) —  179  
Capital expenditures255  127  77  127  —  (5) 581  
Six Months 2020:
External revenues$1,452  $741  $411  $234  $—  $—  $2,838  
Intersegment revenues20  1  —  25  
(a)
—  (46) —  
Net income attributable to Ameren common shareholders142  73  64  106  
(b)
4  —  389  
Capital expenditures516  262  140  305  2  3  1,228  
Six Months 2019:
External revenues$1,541  $744  $456  $194  $—  $—  $2,935  
Intersegment revenues15  2  —  29  
(a)
—  (46) —  
Net income attributable to Ameren common shareholders146  73  58  86  
(b)
7  —  370  
Capital expenditures495  251  128  248  10  (7) 1,125  
(a)Ameren Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution.
(b)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 2020:
External revenues$352  $140  $75  $—  $567  
Intersegment revenues—  —  12  
(a)
(12) —  
Net income available to common shareholder36  9  38  —  83  
Capital expenditures139  79  119  —  337  
Three Months 2019:
External revenues$359  $136  $52  $—  $547  
Intersegment revenues—  —  14  
(a)
(14) —  
Net income available to common shareholder37  1  24  —  62  
Capital expenditures127  77  85  —  289  
Six Months 2020:
External revenues$742  $411  $137  $—  $1,290  
Intersegment revenues—  —  24  
(a)
(24) —  
Net income available to common shareholder73  64  66  —  203  
Capital expenditures262  140  259  —  661  
Six Months 2019:
External revenues$746  $456  $107  $—  $1,309  
Intersegment revenues—  —  29  
(a)
(29) —  
Net income available to common shareholder73  58  51  —  182  
Capital expenditures251  128  177  —  556  
(a)Ameren Illinois Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution.
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, 2020 and 2019. 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 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 gas revenues$21  $—  $140  $—  $—  $161  
Total revenues(a)
$792  $352  $140  $136  $(22) $1,398  
Three Months 2019:
Residential$333  $199  $—  $—  $—  $532  
Commercial310  124  —  —  —  434  
Industrial77  33  —  —  —  110  
Other53  

3  —  109  (23) 142  

Total electric revenues$773  $359  $—  $109  $(23) $1,218  
Residential$10  $—  $88  $—  $—  $98  
Commercial4  —  23  —  —  27  
Industrial—  —  3  —  —  3  
Other11  —  22  —  —  33  
Total gas revenues$25  $—  $136  $—  $—  $161  
Total revenues(a)
$798  $359  $136  $109  $(23) $1,379  
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  
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Six Months 2019:
Residential$645  $416  $—  $—  $—  $1,061  
Commercial549  247  —  —  —  796  
Industrial132  67  —  —  —  199  
Other151  16  —  223  (46) 344  
Total electric revenues$1,477  $746  $—  $223  $(46) $2,400  
Residential$48  $—  $334  $—  $—  $382  
Commercial20  —  88  —  —  108  
Industrial2  —  7  —  —  9  
Other9  —  27  —  —  36  
Total natural gas revenues$79  $—  $456  $—  $—  $535  
Total revenues(a)
$1,556  $746  $456  $223  $(46) $2,935  
(a)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2020 and 2019:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionAmeren
Three Months 2020:
Revenues from alternative revenue programs$(6) $5  $3  $18  $20  
Other revenues not from contracts with customers7  —  —  —  7  
Three Months 2019:
Revenues from alternative revenue programs$—  $12  $4  $(8) $8  
Other revenues not from contracts with customers4  1  —  —  5  
Six Months 2020:
Revenues from alternative revenue programs$(9) $51  $14  $30  $86  
Other revenues not from contracts with customers15  1  1  —  17  
Six Months 2019:
Revenues from alternative revenue programs$15  $34  $1  $(13) $37  
Other revenues not from contracts with customers9  4  1  —  14  
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
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  
Three Months 2019:
Residential$199  $88  $—  $—  $287  
Commercial124  23  —  —  147  
Industrial33  3  —  —  36  
Other3  22  66  (14) 77  
Total revenues(a)
$359  $136  $66  $(14) $547  
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  
Six Months 2019:
Residential$416  $334  $—  $—  $750  
Commercial247  88  —  —  335  
Industrial67  7  —  —  74  
Other16  27  136  (29) 150  
Total revenues(a)
$746  $456  $136  $(29) $1,309  
(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, 2020 and 2019:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2020:
Revenues from alternative revenue programs$5  $3  $14  $22  
Other revenues not from contracts with customers—  —  —  —  
Three Months 2019:
Revenues from alternative revenue programs$12  $4  $(9) $7  
Other revenues not from contracts with customers1  —  —  1  
Six Months 2020:
Revenues from alternative revenue programs$51  $14  $24  $89  
Other revenues not from contracts with customers1  1  —  2  
Six Months 2019:
Revenues from alternative revenue programs$34  $1  $(14) $21  
Other revenues not from contracts with customers4  1  —  5