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Long-Term debt and Equity Financings (Details) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2022 USD ($) | Jul. 31, 2022 $ / shares shares | Apr. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Jun. 30, 2021 shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Dec. 31, 2022 USD ($) | Jul. 12, 2022 shares | May 31, 2021 USD ($)
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | shares |  |  |  | 0.2 |  | 0.2 | 0.3 | 0.3 |  |  |
Stock Issued During Period, Shares, Other | shares |  |  |  | 0.0 | 0.4 | 0.0 | 0.4 | 0.5 |  |  |
Stock Issued During Period, Value, Other |  |  |  |  | $ 31.0 |  |  |  |  |  |
Maximum Value Of Shares To Be Issued Under ATM Program |  |  |  |  |  |  |  |  |  |  | $ 750.0
Value of Shares Available to be Issued Under ATM Program |  |  |  | $ 90.0 |  |  | $ 90.0 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Basis Spread |  |  |  | 75 |  |  | 75 |  |  |  |
Issuances of common stock |  |  |  |  |  |  | $ 17.0 | $ 258.0 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  |  |  |  |  |  | $ 86.35 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  |  |  |  |  |  | 94.80 |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  |  |  |  |  |  | $ 89.78 |  |  |  |
Dividend reinvestment and 401 (k) plans |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuances of common stock |  |  |  | $ 4.0 |  |  | $ 17.0 |  |  |  |
Accrued Proceeds from Issuance of Common Stock |  |  |  |  |  |  | $ 8.0 |  |  |  |
Forward Sale Agreements Outstanding |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | shares |  |  |  | 5.6 |  |  | 5.6 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  | $ 500.0 |  |  | $ 500.0 |  |  |  |
Period End Net Cash Settlement Price |  |  |  | 8.0 |  |  | 8.0 |  |  |  |
Period End Net Share Settlement Price |  |  |  | 0.1 |  |  | 0.1 |  |  |  |
Forward Sale Agreement Equity Offering Shares |  |  |  | 5.6 |  |  | 5.6 |  |  |  |
Forward Sale Agreement Gross Sales Price |  |  |  | 510.0 |  |  | 510.0 |  |  |  |
Forward Sale Agreement, Compensation Received by Counterparty |  |  |  | 5.0 |  |  | 5.0 |  |  |  |
Subsequent Event | Forward Sale Agreements Outstanding |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Indexed Shares (in shares) | shares |  | 5.8 |  |  |  |  |  |  |  |  |
Forward Contract Indexed tp Issuer's Equity, Expected Settlement |  |  |  |  |  |  |  |  | $ 300.0 |  |
Subsequent Event | April 1, 2022 Forward Sale |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Indexed Shares (in shares) | shares |  |  |  |  |  |  |  |  |  | 0.2 |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  | $ 90.77 |  |  |  |  |  |  |  |  |
Union Electric Company | Secured Debt | Senior Secured Notes 3.90% Due 2052 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 525.0 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.90% |  |  |  |  |  |  |  |
Proceeds from Issuance of Secured Debt |  |  | $ 519.0 |  |  |  |  |  |  |  |
Ameren Transmission Company of Illinois | Unsecured Debt | Senior Unsecured Notes, 2.96%, Due 2052 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 95.0 |  |  | $ 95.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.96% |  |  | 2.96% |  |  |  |
Ameren Transmission Company of Illinois | Unsecured Debt | Senior Unsecured Notes, 2.96%, Due 2052 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 95.0 |  |  |  |  |  |  |  |  |  |
Ameren Transmission Company of Illinois | Unsecured Debt | Senior Unsecured Notes, 3.43%, Due 2050 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.43% |  |  | 3.43% |  |  |  |
Long-Term Debt, Maturity, Year One |  |  |  | $ 50.0 |  |  | $ 50.0 |  |  |  |

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