Segment Information (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
$ 2,882
|
$ 2,699
|
$ 7,150
|
$ 7,017
|
| Revenues |
2,882
|
2,699
|
7,150
|
7,017
|
| Revenues from alternative revenue programs |
(214)
|
(209)
|
(125)
|
(205)
|
| Other revenues not from contracts with customers |
5
|
5
|
14
|
14
|
| Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(2)
|
0
|
(5)
|
(4)
|
| Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(188)
|
(187)
|
(116)
|
(174)
|
| Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(6)
|
(10)
|
21
|
(6)
|
| Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(18)
|
(12)
|
(25)
|
(21)
|
| Electric |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
2,722
|
2,563
|
6,270
|
6,223
|
| Revenues |
2,722
|
2,563
|
6,270
|
6,223
|
| Electric | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
1,283
|
1,171
|
2,807
|
2,615
|
| Electric | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
807
|
772
|
1,883
|
1,750
|
| Electric | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
164
|
165
|
437
|
413
|
| Electric | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
468
|
455
|
1,143
|
1,445
|
| Natural gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
160
|
136
|
880
|
794
|
| Revenues |
160
|
136
|
880
|
794
|
| Natural gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
91
|
79
|
580
|
551
|
| Natural gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
30
|
26
|
172
|
155
|
| Natural gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
2
|
2
|
13
|
12
|
| Natural gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
37
|
29
|
115
|
76
|
| Ameren Illinois Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
1,053
|
946
|
3,180
|
2,889
|
| Revenues |
1,053
|
946
|
3,180
|
2,889
|
| Revenues from alternative revenue programs |
(211)
|
(209)
|
(118)
|
(200)
|
| Other revenues not from contracts with customers |
5
|
3
|
12
|
13
|
| Ameren Illinois Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
589
|
539
|
1,713
|
1,618
|
| Ameren Illinois Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
260
|
256
|
768
|
722
|
| Ameren Illinois Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
40
|
48
|
155
|
153
|
| Ameren Illinois Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
164
|
103
|
544
|
396
|
| Ameren Illinois Company | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(188)
|
(187)
|
(116)
|
(174)
|
| Other revenues not from contracts with customers |
5
|
3
|
10
|
11
|
| Ameren Illinois Company | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(6)
|
(10)
|
21
|
(6)
|
| Other revenues not from contracts with customers |
0
|
0
|
2
|
2
|
| Ameren Illinois Company | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(17)
|
(12)
|
(23)
|
(20)
|
| Other revenues not from contracts with customers |
0
|
0
|
0
|
0
|
| Ameren Illinois Company | Electric |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
917
|
829
|
2,432
|
2,203
|
| Ameren Illinois Company | Natural gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
136
|
117
|
748
|
686
|
| Operating Segments | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
1,770
|
1,696
|
3,801
|
3,978
|
| Revenues |
1,781
|
1,705
|
3,835
|
4,002
|
| Other revenues not from contracts with customers |
2
|
2
|
6
|
5
|
| Operating Segments | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
774
|
698
|
2,046
|
1,838
|
| Revenues |
777
|
699
|
2,049
|
1,844
|
| Other revenues not from contracts with customers |
5
|
3
|
10
|
11
|
| Operating Segments | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
136
|
117
|
748
|
686
|
| Revenues |
136
|
117
|
748
|
686
|
| Other revenues not from contracts with customers |
0
|
0
|
2
|
2
|
| Operating Segments | Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
202
|
188
|
555
|
515
|
| Revenues |
266
|
240
|
722
|
658
|
| Other revenues not from contracts with customers |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
1,757
|
1,685
|
3,702
|
3,893
|
| Operating Segments | Electric | Union Electric Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
773
|
702
|
1,598
|
1,483
|
| Operating Segments | Electric | Union Electric Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
571
|
537
|
1,254
|
1,154
|
| Operating Segments | Electric | Union Electric Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
126
|
119
|
292
|
269
|
| Operating Segments | Electric | Union Electric Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
287
|
327
|
558
|
987
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
777
|
699
|
2,049
|
1,844
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
510
|
469
|
1,209
|
1,132
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
236
|
235
|
629
|
596
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
38
|
46
|
145
|
144
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(7)
|
(51)
|
66
|
(28)
|
| Operating Segments | Electric | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Illinois Natural Gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Illinois Natural Gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Illinois Natural Gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Illinois Natural Gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
266
|
240
|
722
|
658
|
| Operating Segments | Electric | Ameren Transmission | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Transmission | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Transmission | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Ameren Transmission | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
266
|
240
|
722
|
658
|
| Operating Segments | Natural gas | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
24
|
20
|
133
|
109
|
| Operating Segments | Natural gas | Union Electric Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
12
|
9
|
76
|
65
|
| Operating Segments | Natural gas | Union Electric Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
6
|
5
|
33
|
29
|
| Operating Segments | Natural gas | Union Electric Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
3
|
3
|
| Operating Segments | Natural gas | Union Electric Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
6
|
6
|
21
|
12
|
| Operating Segments | Natural gas | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Illinois Electric Distribution | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Illinois Electric Distribution | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Illinois Electric Distribution | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Illinois Electric Distribution | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
136
|
117
|
748
|
686
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
79
|
70
|
504
|
486
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
24
|
21
|
139
|
126
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
2
|
2
|
10
|
9
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
31
|
24
|
95
|
65
|
| Operating Segments | Natural gas | Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Transmission | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Transmission | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Transmission | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Natural gas | Ameren Transmission | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
777
|
699
|
2,049
|
1,844
|
| Revenues |
777
|
699
|
2,049
|
1,844
|
| Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
136
|
117
|
748
|
686
|
| Revenues |
136
|
117
|
748
|
686
|
| Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
140
|
130
|
383
|
359
|
| Revenues |
196
|
176
|
528
|
482
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
777
|
699
|
2,049
|
1,844
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
510
|
469
|
1,209
|
1,132
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
236
|
235
|
629
|
596
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
38
|
46
|
145
|
144
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(7)
|
(51)
|
66
|
(28)
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
196
|
176
|
528
|
482
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Transmission | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Transmission | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Transmission | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Transmission | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
196
|
176
|
528
|
482
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
136
|
117
|
748
|
686
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
79
|
70
|
504
|
486
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
24
|
21
|
139
|
126
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
2
|
2
|
10
|
9
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
31
|
24
|
95
|
65
|
| Intersegment Eliminations |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(78)
|
(62)
|
(204)
|
(173)
|
| Revenues |
(78)
|
(62)
|
(204)
|
(173)
|
| Other revenues not from contracts with customers |
(2)
|
0
|
(4)
|
(4)
|
| Intersegment Eliminations | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(11)
|
(9)
|
(34)
|
(24)
|
| Intersegment Eliminations | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(3)
|
(1)
|
(3)
|
(6)
|
| Intersegment Eliminations | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(64)
|
(52)
|
(167)
|
(143)
|
| Intersegment Eliminations | Electric |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(78)
|
(61)
|
(203)
|
(172)
|
| Intersegment Eliminations | Electric | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Electric | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Electric | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Electric | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(78)
|
(61)
|
(203)
|
(172)
|
| Intersegment Eliminations | Natural gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
(1)
|
(1)
|
(1)
|
| Intersegment Eliminations | Natural gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Natural gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Natural gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Natural gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
(1)
|
(1)
|
(1)
|
| Intersegment Eliminations | Ameren Illinois Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(56)
|
(46)
|
(145)
|
(123)
|
| Revenues |
(56)
|
(46)
|
(145)
|
(123)
|
| Intersegment Eliminations | Ameren Illinois Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Illinois Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Illinois Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Illinois Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(56)
|
(46)
|
(145)
|
(123)
|
| Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
$ (56)
|
$ (46)
|
$ (145)
|
$ (123)
|