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v3.23.1

Long-Term debt and Equity Financings (Details) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2023 $ / shares | Mar. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) shares | Mar. 31, 2022 USD ($) shares | Apr. 14, 2023 shares
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | shares |  | 100 |  | 100 |
Issuances of common stock |  | $ 5,000,000 |  | $ 5,000,000 |
Stock Issued During Period, Shares, Other | shares |  | 500 | 500 | 400 |
Stock Issued During Period, Value, Other |  |  | $ 37,000,000 |  |
Maximum Value Of Shares To Be Issued Under ATM Program |  | $ 980,000,000 |  |  |
Forward Contract Indexed to Issuer's Equity, Basis Spread |  | 75 |  |  |
Subsequent Event |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Indexed Shares (in shares) | shares |  |  |  |  | 400
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | $ 89.11 |  |  |  |
Minimum |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  | $ 89.31 |  |  |
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 |  | $ 92.66 |  |  |
Dividend reinvestment and 401 (k) plans |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |
Issuances of common stock |  | $ 5,000,000 |  |  |
Accrued Proceeds from Issuance of Common Stock |  | $ 7,000,000 |  |  |
Forward Sale Agreements Outstanding |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Indexed Shares (in shares) | shares |  | 3,800 |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | shares |  | 3,400 |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  | $ 317,000,000 |  |  |
Period End Net Cash Settlement Price |  | 21,000,000 |  |  |
Period End Net Share Settlement Price |  | 200,000 |  |  |
Forward Sale Agreement Equity Offering Shares |  | 3,400,000 |  |  |
Forward Sale Agreement Gross Sales Price |  | 321,000,000 |  |  |
Forward Sale Agreement, Compensation Received by Counterparty |  | 3,000,000 |  |  |
Union Electric Company | Secured Debt | Senior Secured Notes 5.45% Due 2053 |  |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.45% |  |  |
Proceeds from Issuance of Secured Debt |  | $ 495,000,000 |  |  |

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