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Commitments And Contingencies (Other Obligations) (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
MWh
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 245
2021 672
2022 402
2023 274
2024 169
Thereafter 231
Total unrecorded unconditional purchase obligation 1,993
Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 94
2021 242
2022 193
2023 113
2024 94
Thereafter 55
Total unrecorded unconditional purchase obligation 791
Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 52
2021 161
2022 108
2023 69
2024 28
Thereafter 73
Total unrecorded unconditional purchase obligation 491
Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 3
2021 57
2022 12
2023 45
2024 20
Thereafter 21
Total unrecorded unconditional purchase obligation 158
Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 57
2021 156
2022 63
2023 21
2024 4
Thereafter 0
Total unrecorded unconditional purchase obligation $ 301
Amount of Megawatts | MWh 102
Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 0
2021 3
2022 3
2023 3
2024 3
Thereafter 21
Total unrecorded unconditional purchase obligation 33
Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 39
2021 53
2022 23
2023 23
2024 20
Thereafter 61
Total unrecorded unconditional purchase obligation 219
Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 36
Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 42
Union Electric Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 131
2021 391
2022 269
2023 216
2024 150
Thereafter 143
Total unrecorded unconditional purchase obligation 1,300
Union Electric Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 94
2021 242
2022 193
2023 113
2024 94
Thereafter 55
Total unrecorded unconditional purchase obligation 791
Union Electric Company | Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 12
2021 43
2022 38
2023 32
2024 13
Thereafter 22
Total unrecorded unconditional purchase obligation 160
Union Electric Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 3
2021 57
2022 12
2023 45
2024 20
Thereafter 21
Total unrecorded unconditional purchase obligation 158
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 $ 0
2021 3
2022 3
2023 3
2024 3
Thereafter 21
Total unrecorded unconditional purchase obligation 33
Union Electric Company | Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 22
2021 46
2022 23
2023 23
2024 20
Thereafter 24
Total unrecorded unconditional purchase obligation 158
Ameren Illinois Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 111
2021 276
2022 133
2023 58
2024 19
Thereafter 51
Total unrecorded unconditional purchase obligation 648
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 40
2021 118
2022 70
2023 37
2024 15
Thereafter 51
Total unrecorded unconditional purchase obligation 331
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 57
2021 156
2022 63
2023 21
2024 4
Thereafter 0
Total unrecorded unconditional purchase obligation 301
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 14
2021 2
2022 0
2023 0
2024 0
Thereafter 0
Total unrecorded unconditional purchase obligation 16
Ameren Illinois Company | Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 36
Ameren Illinois Company | Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation $ 42