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Commitments And Contingencies (Schedule Of Estimated Purchased Commitments) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
MWh
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 $ 788
2022 413
2023 284
2024 186
2025 103
Thereafter 195
Total unrecorded unconditional purchase obligation 1,969
Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 321
2022 194
2023 113
2024 94
2025 55
Thereafter 0
Total unrecorded unconditional purchase obligation 777
Natural gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 161
2022 111
2023 72
2024 31
2025 17
Thereafter 64
Total unrecorded unconditional purchase obligation 456
Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 56
2022 12
2023 45
2024 26
2025 0
Thereafter 21
Total unrecorded unconditional purchase obligation 160
Total Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 150
2022 64
2023 24
2024 7
2025 0
Thereafter 0
Total unrecorded unconditional purchase obligation $ 245
Amount of Megawatts | MWh 102
Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 $ 3
2022 3
2023 3
2024 3
2025 3
Thereafter 18
Total unrecorded unconditional purchase obligation 33
Other(e)  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 97
2022 29
2023 27
2024 25
2025 28
Thereafter 92
Total unrecorded unconditional purchase obligation 298
Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 48
Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 26
Union Electric Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 503
2022 279
2023 224
2024 164
2025 94
Thereafter 126
Total unrecorded unconditional purchase obligation 1,390
Union Electric Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 321
2022 194
2023 113
2024 94
2025 55
Thereafter 0
Total unrecorded unconditional purchase obligation 777
Union Electric Company | Natural gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 44
2022 40
2023 35
2024 15
2025 7
Thereafter 17
Total unrecorded unconditional purchase obligation 158
Union Electric Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 56
2022 12
2023 45
2024 26
2025 0
Thereafter 21
Total unrecorded unconditional purchase obligation 160
Union Electric Company | Total Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 0
2022 0
2023 0
2024 0
2025 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]  
2021 $ 3
2022 3
2023 3
2024 3
2025 3
Thereafter 18
Total unrecorded unconditional purchase obligation 33
Union Electric Company | Other(e)  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 79
2022 30
2023 28
2024 26
2025 29
Thereafter 70
Total unrecorded unconditional purchase obligation 262
Ameren Illinois Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 290
2022 138
2023 62
2024 23
2025 10
Thereafter 47
Total unrecorded unconditional purchase obligation 570
Ameren Illinois Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 0
2022 0
2023 0
2024 0
2025 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Natural gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 117
2022 71
2023 37
2024 16
2025 10
Thereafter 47
Total unrecorded unconditional purchase obligation 298
Ameren Illinois Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 0
2022 0
2023 0
2024 0
2025 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Total Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 160
2022 67
2023 25
2024 7
2025 0
Thereafter 0
Total unrecorded unconditional purchase obligation 259
Ameren Illinois Company | Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 0
2022 0
2023 0
2024 0
2025 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Other(e)  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 13
2022 0
2023 0
2024 0
2025 0
Thereafter 0
Total unrecorded unconditional purchase obligation 13
Ameren Illinois Company | Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 48
Ameren Illinois Company | Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation $ 26