Segment Information (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
$ 2,221
|
$ 1,693
|
$ 4,318
|
$ 3,509
|
| Revenues |
2,221
|
1,693
|
4,318
|
3,509
|
| Revenues from alternative revenue programs |
(14)
|
25
|
4
|
86
|
| Other revenues not from contracts with customers |
4
|
3
|
9
|
7
|
| Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
1
|
(1)
|
(4)
|
(7)
|
| Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(8)
|
22
|
13
|
61
|
| Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
1
|
0
|
4
|
19
|
| Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(8)
|
4
|
(9)
|
13
|
| Electric |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
2,038
|
1,521
|
3,660
|
2,885
|
| Revenues |
2,038
|
1,521
|
3,660
|
2,885
|
| Electric | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
726
|
706
|
1,444
|
1,344
|
| Electric | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
525
|
487
|
978
|
911
|
| Electric | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
132
|
124
|
248
|
230
|
| Electric | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
655
|
204
|
990
|
400
|
| Natural gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
183
|
172
|
658
|
624
|
| Revenues |
183
|
172
|
658
|
624
|
| Natural gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
120
|
115
|
472
|
442
|
| Natural gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
33
|
29
|
129
|
113
|
| Natural gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
4
|
2
|
10
|
8
|
| Natural gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
26
|
26
|
47
|
61
|
| Ameren Illinois Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
843
|
766
|
1,943
|
1,766
|
| Revenues |
843
|
766
|
1,943
|
1,766
|
| Revenues from alternative revenue programs |
(14)
|
24
|
9
|
90
|
| Other revenues not from contracts with customers |
6
|
2
|
10
|
5
|
| Ameren Illinois Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
428
|
413
|
1,079
|
997
|
| Ameren Illinois Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
209
|
187
|
466
|
420
|
| Ameren Illinois Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
51
|
48
|
105
|
97
|
| Ameren Illinois Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
155
|
118
|
293
|
252
|
| Ameren Illinois Company | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(8)
|
22
|
13
|
61
|
| Other revenues not from contracts with customers |
5
|
1
|
8
|
3
|
| Ameren Illinois Company | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
1
|
0
|
4
|
19
|
| Other revenues not from contracts with customers |
1
|
1
|
2
|
2
|
| Ameren Illinois Company | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues from alternative revenue programs |
(7)
|
2
|
(8)
|
10
|
| Other revenues not from contracts with customers |
0
|
0
|
0
|
0
|
| Ameren Illinois Company | Electric |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
685
|
618
|
1,374
|
1,227
|
| Ameren Illinois Company | Natural gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
158
|
148
|
569
|
539
|
| Operating Segments | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
1,332
|
879
|
2,282
|
1,647
|
| Revenues |
1,340
|
888
|
2,297
|
1,663
|
| Other revenues not from contracts with customers |
2
|
1
|
3
|
2
|
| Operating Segments | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
570
|
509
|
1,140
|
1,015
|
| Revenues |
573
|
509
|
1,145
|
1,015
|
| Other revenues not from contracts with customers |
5
|
1
|
8
|
3
|
| Operating Segments | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
158
|
148
|
569
|
539
|
| Revenues |
158
|
148
|
569
|
539
|
| Other revenues not from contracts with customers |
1
|
1
|
2
|
2
|
| Operating Segments | Ameren Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
161
|
157
|
327
|
308
|
| Revenues |
208
|
191
|
418
|
376
|
| Other revenues not from contracts with customers |
0
|
0
|
0
|
0
|
| Operating Segments | Electric | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
1,315
|
864
|
2,208
|
1,578
|
| Operating Segments | Electric | Union Electric Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
405
|
395
|
781
|
736
|
| Operating Segments | Electric | Union Electric Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
344
|
324
|
617
|
583
|
| Operating Segments | Electric | Union Electric Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
84
|
77
|
150
|
138
|
| Operating Segments | Electric | Union Electric Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
482
|
68
|
660
|
121
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
573
|
509
|
1,145
|
1,015
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
321
|
311
|
663
|
608
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
181
|
163
|
361
|
328
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
48
|
47
|
98
|
92
|
| Operating Segments | Electric | Ameren Illinois Electric Distribution | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
23
|
(12)
|
23
|
(13)
|
| 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 |
208
|
191
|
418
|
376
|
| 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 |
208
|
191
|
418
|
376
|
| Operating Segments | Natural gas | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
25
|
24
|
89
|
85
|
| Operating Segments | Natural gas | Union Electric Company | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
13
|
13
|
56
|
53
|
| Operating Segments | Natural gas | Union Electric Company | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
5
|
5
|
24
|
21
|
| Operating Segments | Natural gas | Union Electric Company | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
1
|
1
|
3
|
3
|
| Operating Segments | Natural gas | Union Electric Company | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
6
|
5
|
6
|
8
|
| 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 |
158
|
148
|
569
|
539
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
107
|
102
|
416
|
389
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
28
|
24
|
105
|
92
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
3
|
1
|
7
|
5
|
| Operating Segments | Natural gas | Ameren Illinois Natural Gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
20
|
21
|
41
|
53
|
| 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 |
573
|
509
|
1,145
|
1,015
|
| Revenues |
573
|
509
|
1,145
|
1,015
|
| Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
158
|
148
|
569
|
539
|
| Revenues |
158
|
148
|
569
|
539
|
| Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
112
|
109
|
229
|
212
|
| Revenues |
152
|
136
|
306
|
267
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
573
|
509
|
1,145
|
1,015
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
321
|
311
|
663
|
608
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
181
|
163
|
361
|
328
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
48
|
47
|
98
|
92
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Electric Distribution | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
23
|
(12)
|
23
|
(13)
|
| Operating Segments | Ameren Illinois Company | Electric | Ameren Illinois Transmission |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
152
|
136
|
306
|
267
|
| 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 |
152
|
136
|
306
|
267
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
158
|
148
|
569
|
539
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Residential |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
107
|
102
|
416
|
389
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
28
|
24
|
105
|
92
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Industrial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Operating Revenues |
3
|
1
|
7
|
5
|
| Operating Segments | Ameren Illinois Company | Natural gas | Ameren Illinois Natural Gas | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
20
|
21
|
41
|
53
|
| Intersegment Eliminations |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(58)
|
(43)
|
(111)
|
(84)
|
| Revenues |
(58)
|
(43)
|
(111)
|
(84)
|
| Other revenues not from contracts with customers |
(4)
|
0
|
(4)
|
0
|
| Intersegment Eliminations | Union Electric Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(8)
|
(9)
|
(15)
|
(16)
|
| Intersegment Eliminations | Ameren Illinois Electric Distribution |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(3)
|
0
|
(5)
|
0
|
| 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 |
(47)
|
(34)
|
(91)
|
(68)
|
| Intersegment Eliminations | Electric |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(58)
|
(43)
|
(111)
|
(84)
|
| 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 |
(58)
|
(43)
|
(111)
|
(84)
|
| Intersegment Eliminations | Natural gas |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
0
|
0
|
0
|
0
|
| 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
|
0
|
0
|
0
|
| Intersegment Eliminations | Ameren Illinois Company |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenues |
(40)
|
(27)
|
(77)
|
(55)
|
| Revenues |
(40)
|
(27)
|
(77)
|
(55)
|
| 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 |
(40)
|
(27)
|
(77)
|
(55)
|
| 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 |
$ (40)
|
$ (27)
|
$ (77)
|
$ (55)
|