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Commitments And Contingencies (Other Obligations) (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
MWh
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 456
2021 613
2022 359
2023 249
2024 158
Thereafter 227
Total unrecorded unconditional purchase obligation 2,062
Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 172
2021 235
2022 193
2023 113
2024 94
Thereafter 55
Total unrecorded unconditional purchase obligation 862
Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 102
2021 148
2022 89
2023 52
2024 21
Thereafter 72
Total unrecorded unconditional purchase obligation 484
Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 7
2021 57
2022 11
2023 45
2024 15
Thereafter 16
Total unrecorded unconditional purchase obligation 151
Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 115
2021 113
2022 37
2023 12
2024 2
Thereafter 0
Total unrecorded unconditional purchase obligation $ 279
Amount of Megawatts | MWh 102
Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 1
2021 3
2022 3
2023 3
2024 3
Thereafter 21
Total unrecorded unconditional purchase obligation 34
Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 59
2021 57
2022 26
2023 24
2024 23
Thereafter 63
Total unrecorded unconditional purchase obligation 252
Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 33
Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 58
Union Electric Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 246
2021 368
2022 253
2023 201
2024 141
Thereafter 139
Total unrecorded unconditional purchase obligation 1,348
Union Electric Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 172
2021 235
2022 193
2023 113
2024 94
Thereafter 55
Total unrecorded unconditional purchase obligation 862
Union Electric Company | Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 22
2021 33
2022 20
2023 16
2024 6
Thereafter 21
Total unrecorded unconditional purchase obligation 118
Union Electric Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 7
2021 57
2022 11
2023 45
2024 15
Thereafter 16
Total unrecorded unconditional purchase obligation 151
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 $ 1
2021 3
2022 3
2023 3
2024 3
Thereafter 21
Total unrecorded unconditional purchase obligation 34
Union Electric Company | Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 44
2021 40
2022 26
2023 24
2024 23
Thereafter 26
Total unrecorded unconditional purchase obligation 183
Ameren Illinois Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 205
2021 240
2022 106
2023 48
2024 17
Thereafter 51
Total unrecorded unconditional purchase obligation 667
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 80
2021 115
2022 69
2023 36
2024 15
Thereafter 51
Total unrecorded unconditional purchase obligation 366
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 115
2021 113
2022 37
2023 12
2024 2
Thereafter 0
Total unrecorded unconditional purchase obligation 279
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 10
2021 12
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 22
Ameren Illinois Company | Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 33
Ameren Illinois Company | Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation $ 58