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Long-Term Debt and Equity Financings (Schedule of Required and Actual Debt Ratios) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Union Electric Company |
Debt Instrument [Line Items] |
Bonds Issuable Based On Coverage Ratio | $ 4,461
Preferred Stock Issuable Based On Coverage Ratio | 3,179
Retired Bond Capacity | $ 1,959
Union Electric Company | Actual Interest Coverage Ratio |
Debt Instrument [Line Items] |
Interest Coverage Ratio | 3.4
Dividend Coverage Ratio | 165.2
Ameren Illinois Company |
Debt Instrument [Line Items] |
Bonds Issuable Based On Coverage Ratio | $ 8,237
Preferred Stock Issuable Based On Coverage Ratio | 203
Retired Bond Capacity | $ 1,043
Ameren Illinois Company | Actual Interest Coverage Ratio |
Debt Instrument [Line Items] |
Interest Coverage Ratio | 6.9
Dividend Coverage Ratio | 3.5
Minimum | Union Electric Company | Required Dividend Coverage Ratio |
Debt Instrument [Line Items] |
Interest Coverage Ratio | 2.0
Dividend Coverage Ratio | 2.5
Minimum | Ameren Illinois Company | Required Dividend Coverage Ratio |
Debt Instrument [Line Items] |
Interest Coverage Ratio | 2.0
Dividend Coverage Ratio | 1.5

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