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Commitments And Contingencies (Other Obligations) (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
MWh
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 $ 291
2020 630
2021 438
2022 235
2023 140
Thereafter 188
Total unrecorded unconditional purchase obligation 1,922
Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 142
2020 226
2021 195
2022 137
2023 46
Thereafter 0
Total unrecorded unconditional purchase obligation 746
Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 51
2020 172
2021 105
2022 49
2023 25
Thereafter 48
Total unrecorded unconditional purchase obligation 450
Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 21
2020 43
2021 59
2022 12
2023 42
Thereafter 29
Total unrecorded unconditional purchase obligation 206
Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 56
2020 146
2021 50
2022 12
2023 2
Thereafter 0
Total unrecorded unconditional purchase obligation $ 266
Amount of Megawatts | MWh 102
Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 $ 1
2020 3
2021 3
2022 3
2023 3
Thereafter 26
Total unrecorded unconditional purchase obligation 39
Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 20
2020 40
2021 26
2022 22
2023 22
Thereafter 85
Total unrecorded unconditional purchase obligation 215
Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 11
Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 44
Union Electric Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 190
2020 340
2021 302
2022 185
2023 123
Thereafter 120
Total unrecorded unconditional purchase obligation 1,260
Union Electric Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 142
2020 226
2021 195
2022 137
2023 46
Thereafter 0
Total unrecorded unconditional purchase obligation 746
Union Electric Company | Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 10
2020 39
2021 23
2022 11
2023 10
Thereafter 17
Total unrecorded unconditional purchase obligation 110
Union Electric Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 21
2020 43
2021 59
2022 12
2023 42
Thereafter 29
Total unrecorded unconditional purchase obligation 206
Union Electric Company | Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 0
2020 0
2021 0
2022 0
2023 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]  
2019 $ 1
2020 3
2021 3
2022 3
2023 3
Thereafter 26
Total unrecorded unconditional purchase obligation 39
Union Electric Company | Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 16
2020 29
2021 22
2022 22
2023 22
Thereafter 48
Total unrecorded unconditional purchase obligation 159
Ameren Illinois Company  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 99
2020 280
2021 132
2022 50
2023 17
Thereafter 31
Total unrecorded unconditional purchase obligation 609
Ameren Illinois Company | Coal  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 0
2020 0
2021 0
2022 0
2023 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Natural Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 41
2020 133
2021 82
2022 38
2023 15
Thereafter 31
Total unrecorded unconditional purchase obligation 340
Ameren Illinois Company | Nuclear Fuel  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 0
2020 0
2021 0
2022 0
2023 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Purchased Power  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 56
2020 146
2021 50
2022 12
2023 2
Thereafter 0
Total unrecorded unconditional purchase obligation 266
Ameren Illinois Company | Methane Gas  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 0
2020 0
2021 0
2022 0
2023 0
Thereafter 0
Total unrecorded unconditional purchase obligation 0
Ameren Illinois Company | Other  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 2
2020 1
2021 0
2022 0
2023 0
Thereafter 0
Total unrecorded unconditional purchase obligation 3
Ameren Illinois Company | Renewable Energy Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation 11
Ameren Illinois Company | Zero Emission Credits  
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
Total unrecorded unconditional purchase obligation $ 44