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Property And Plant, Net (Schedule Of Property And Plant, Net) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | $ 16,495 | $ 15,426
Property, plant, and equipment, net | 36,304 | 33,776
Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 50,790 | 47,179
Property, plant, and equipment, net | 34,295 | 31,753
Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,556 | 3,452
Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 938 | 921
Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,931 | 5,879
Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,920 | 1,984
Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 17,629 | 16,458
Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 10,162 | 9,508
Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,197 | 4,874
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,457 | 4,103
Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 268 | 173
Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 30 | 29
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,741 | 1,320
Plant To Be Abandoned, Net |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost |  | 530
Ameren Missouri |  |
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 10,875 | 10,243
Property, plant, and equipment, net | 18,788 | 17,250
Ameren Missouri | Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 28,404 | 25,876
Property, plant, and equipment, net | 17,529 | 15,633
Ameren Missouri | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,556 | 3,452
Ameren Missouri | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 938 | 921
Ameren Missouri | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,931 | 5,879
Ameren Missouri | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,901 | 1,973
Ameren Missouri | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 9,469 | 8,638
Ameren Missouri | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,406 | 2,134
Ameren Missouri | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 776 | 688
Ameren Missouri | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,427 | 2,191
Ameren Missouri | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 268 | 173
Ameren Missouri | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 991 | 914
Ameren Missouri | Plant To Be Abandoned, Net |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost |  | 530
Ameren Illinois |  |
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 5,184 | 4,783
Property, plant, and equipment, net | 15,530 | 14,632
Ameren Illinois | Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 20,095 | 19,055
Property, plant, and equipment, net | 14,911 | 14,272
Ameren Illinois | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 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 | 19 | 11
Ameren Illinois | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 8,160 | 7,820
Ameren Illinois | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,725 | 5,381
Ameren Illinois | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,421 | 4,186
Ameren Illinois | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,770 | 1,657
Ameren Illinois | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 619 | 360
Ameren Illinois | Plant To Be Abandoned, Net |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost |  | 0
Other |  |
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 436 | 400
Property, plant, and equipment, net | 1,986 | 1,894
Other | Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,291 | 2,248
Property, plant, and equipment, net | 1,855 | 1,848
Other | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 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 | 2,031 | 1,993
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 | 260 | 255
Other | Nuclear fuel in progress |  |
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 | $ 131 | 46
Other | Plant To Be Abandoned, Net |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost |  | $ 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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