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Property And Plant, Net (Schedule Of Property And Plant, Net) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) equipment | Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | $ 43,839 | $ 41,602
Accumulated depreciation and amortization | 14,465 | 14,214
Property and plant, before construction work in progress | 29,374 | 27,388
Property, plant, and equipment, net | $ 31,262 | 29,261
Number of combustion turbine electric generation equipment with related financing obligations | equipment | 2 |
Gross asset value, financing obligations | $ 125 | 243
Total accumulated depreciation, financing obligations | 54 | 105
Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,454 | 3,955
Plant To Be Abandoned, Net | 582 | 604
Natural Gas and Oil Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 961 | 1,105
Nuclear Powered Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,725 | 5,615
Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,968 | 1,889
Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 15,344 | 14,303
Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 8,316 | 7,533
Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,523 | 4,193
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,548 | 3,009
Construction work in progress: | 1,198 | 1,136
Nuclear fuel in process |  |
Property, Plant and Equipment [Line Items] |  |
Construction work in progress: | 108 | 133
Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 29 | 29
Union Electric Company |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 24,518 | 23,669
Accumulated depreciation and amortization | 9,682 | 9,784
Property and plant, before construction work in progress | 14,836 | 13,885
Property, plant, and equipment, net | 16,124 | 15,296
Union Electric Company | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,454 | 3,955
Plant To Be Abandoned, Net | 582 | 604
Union Electric Company | Natural Gas and Oil Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 961 | 1,105
Union Electric Company | Nuclear Powered Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,725 | 5,615
Union Electric Company | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,957 | 1,889
Union Electric Company | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 7,993 | 7,286
Union Electric Company | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,884 | 1,628
Union Electric Company | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 640 | 607
Union Electric Company | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,904 | 1,584
Construction work in progress: | 598 | 674
Union Electric Company | Nuclear fuel in process |  |
Property, Plant and Equipment [Line Items] |  |
Construction work in progress: | 108 | 133
Ameren Illinois Company |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 17,257 | 15,891
Accumulated depreciation and amortization | 4,418 | 4,100
Property and plant, before construction work in progress | 12,839 | 11,791
Property, plant, and equipment, net | 13,353 | 12,223
Ameren Illinois Company | 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 Company | Natural Gas and Oil Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois Company | Nuclear Powered Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois Company | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 11 | 0
Ameren Illinois Company | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 7,351 | 7,017
Ameren Illinois Company | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,617 | 4,105
Ameren Illinois Company | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,883 | 3,586
Ameren Illinois Company | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,395 | 1,183
Construction work in progress: | 514 | 432
Ameren Illinois Company | Nuclear fuel in process |  |
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 | 2,064 | 2,042
Accumulated depreciation and amortization | 365 | 330
Property and plant, before construction work in progress | 1,699 | 1,712
Property, plant, and equipment, net | 1,785 | 1,742
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 |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Nuclear Powered Electric Generation Equipment |  |
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 | 1,815 | 1,800
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 | 249 | 242
Construction work in progress: | 86 | 30
Other | Nuclear fuel in process |  |
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 | Union Electric Company | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 150 years |

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