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Commitments And Contingencies (Schedule Of Estimated Purchased Power Commitments) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
MWh
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 763
2021 453
2022 243
2023 152
2024 108
Thereafter 167
Total unrecorded unconditional purchase obligation 1,886
Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 325
2021 197
2022 137
2023 46
2024 53
Thereafter 27
Total unrecorded unconditional purchase obligation 785
Natural gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 171
2021 109
2022 55
2023 35
2024 12
Thereafter 43
Total unrecorded unconditional purchase obligation 425
Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 42
2021 60
2022 13
2023 43
2024 15
Thereafter 15
Total unrecorded unconditional purchase obligation 188
Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 147
2021 51
2022 13
2023 3
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation $ 214
Amount of Megawatts | MWh 102
Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 3
2021 3
2022 3
2023 3
2024 3
Thereafter 24
Total unrecorded unconditional purchase obligation 39
Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 75
2021 33
2022 22
2023 22
2024 25
Thereafter 58
Total unrecorded unconditional purchase obligation 235
Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 13
Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 27
Union Electric Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 471
2021 312
2022 189
2023 127
2024 102
Thereafter 109
Total unrecorded unconditional purchase obligation 1,310
Union Electric Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 325
2021 197
2022 137
2023 46
2024 53
Thereafter 27
Total unrecorded unconditional purchase obligation 785
Union Electric Company | Natural gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 40
2021 26
2022 14
2023 13
2024 6
Thereafter 19
Total unrecorded unconditional purchase obligation 118
Union Electric Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 42
2021 60
2022 13
2023 43
2024 15
Thereafter 15
Total unrecorded unconditional purchase obligation 188
Union Electric Company | Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation $ 0
Amount of Megawatts | MWh 102
Union Electric Company | Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 3
2021 3
2022 3
2023 3
2024 3
Thereafter 24
Total unrecorded unconditional purchase obligation 39
Union Electric Company | Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 61
2021 26
2022 22
2023 22
2024 25
Thereafter 24
Total unrecorded unconditional purchase obligation 180
Ameren Illinois Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 281
2021 136
2022 54
2023 25
2024 6
Thereafter 24
Total unrecorded unconditional purchase obligation 526
Ameren Illinois Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Natural gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 131
2021 83
2022 41
2023 22
2024 6
Thereafter 24
Total unrecorded unconditional purchase obligation 307
Ameren Illinois Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 147
2021 51
2022 13
2023 3
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 214
Ameren Illinois Company | Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 3
2021 2
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 5
Ameren Illinois Company | Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 13
Ameren Illinois Company | Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation $ 27