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Property And Plant, Net (Schedule Of Property And Plant, Net) (Details) $ in Millions | Dec. 31, 2023 USD ($) equipment | Dec. 31, 2022 USD ($)
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | $ 47,179 | $ 43,839
Accumulated depreciation and amortization | 15,426 | 14,465
Property and plant, before construction work in progress | 31,753 | 29,374
Property, plant, and equipment, net | $ 33,776 | 31,262
Number of combustion turbine electric generation equipment with related financing obligations | equipment | 2 |
Gross asset value, financing obligations |  | 125
Total accumulated depreciation, financing obligations |  | 54
Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | $ 3,452 | 3,454
Plant To Be Abandoned, Net | 530 | 582
Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 921 | 961
Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,879 | 5,725
Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,984 | 1,968
Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 16,458 | 15,344
Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 9,508 | 8,316
Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,874 | 4,523
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,103 | 3,548
Construction work in progress: | 1,320 | 1,198
Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Construction work in progress: | 173 | 108
Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 29 | 29
Ameren Missouri |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 25,876 | 24,518
Accumulated depreciation and amortization | 10,243 | 9,682
Property and plant, before construction work in progress | 15,633 | 14,836
Property, plant, and equipment, net | 17,250 | 16,124
Ameren Missouri | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,452 | 3,454
Plant To Be Abandoned, Net | 530 | 582
Ameren Missouri | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 921 | 961
Ameren Missouri | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,879 | 5,725
Ameren Missouri | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,973 | 1,957
Ameren Missouri | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 8,638 | 7,993
Ameren Missouri | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,134 | 1,884
Ameren Missouri | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 688 | 640
Ameren Missouri | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,191 | 1,904
Construction work in progress: | 914 | 598
Ameren Missouri | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Construction work in progress: | 173 | 108
Ameren Illinois |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 19,055 | 17,257
Accumulated depreciation and amortization | 4,783 | 4,418
Property and plant, before construction work in progress | 14,272 | 12,839
Property, plant, and equipment, net | 14,632 | 13,353
Ameren Illinois | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Plant To Be Abandoned, Net | 0 | 0
Ameren Illinois | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 11 | 11
Ameren Illinois | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 7,820 | 7,351
Ameren Illinois | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,381 | 4,617
Ameren Illinois | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,186 | 3,883
Ameren Illinois | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,657 | 1,395
Construction work in progress: | 360 | 514
Ameren Illinois | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Construction work in progress: | 0 | 0
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,248 | 2,064
Accumulated depreciation and amortization | 400 | 365
Property and plant, before construction work in progress | 1,848 | 1,699
Property, plant, and equipment, net | 1,894 | 1,785
Other | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Plant To Be Abandoned, Net | 0 | 0
Other | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,993 | 1,815
Other | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 255 | 249
Construction work in progress: | 46 | 86
Other | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Construction work in progress: | $ 0 | $ 0
Minimum | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 20 years |
Minimum | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 50 years |
Minimum | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 20 years |
Minimum | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 2 years |
Minimum | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Maximum | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 80 years |
Maximum | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 75 years |
Maximum | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 80 years |
Maximum | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 55 years |
Maximum | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 72 years |
Maximum | Ameren Missouri | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 150 years |

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