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Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Assets and Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | $ 180 | $ 155 | $ 145 | $ 301
Short-term debt | 1,221 | 545 |  |
Union Electric Company |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 7 | 8 | 11 | 145
Short-term debt | 178 | 165 |  |
Ameren Illinois Company |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 166 | 133 | $ 122 | $ 147
Short-term debt | 353 | 103 |  |
Carrying Amount |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 180 | 155 |  |
Investments in industrial development revenue bonds | 248 | 248 |  |
Short-term debt | 1,221 | 545 |  |
Long-term debt (including current portion) | 13,732 | 13,067 |  |
Debt Issuance Costs, Net | 99 | 94 |  |
Carrying Amount | Union Electric Company |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 7 | 8 |  |
Investments in industrial development revenue bonds | 248 | 248 |  |
Short-term debt | 178 | 165 |  |
Long-term debt (including current portion) | 6,140 | 5,619 |  |
Debt Issuance Costs, Net | 42 | 38 |  |
Carrying Amount | Ameren Illinois Company |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 166 | 133 |  |
Short-term debt | 353 | 103 |  |
Long-term debt (including current portion) | 4,489 | 4,392 |  |
Debt Issuance Costs, Net | 41 | 39 |  |
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 180 | 155 |  |
Investments, Fair Value Disclosure | 248 | 248 |  |
Short-term Debt, Fair Value | 1,221 | 545 |  |
Long-term Debt, Fair Value | 11,939 | 14,521 |  |
Fair Value | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 180 | 155 |  |
Investments, Fair Value Disclosure | 0 | 0 |  |
Short-term Debt, Fair Value | 0 | 0 |  |
Long-term Debt, Fair Value | 0 | 0 |  |
Fair Value | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 0 | 0 |  |
Investments, Fair Value Disclosure | 248 | 248 |  |
Short-term Debt, Fair Value | 1,221 | 545 |  |
Long-term Debt, Fair Value | 11,493 | 13,930 |  |
Fair Value | Level 3 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 0 | 0 |  |
Investments, Fair Value Disclosure | 0 | 0 |  |
Short-term Debt, Fair Value | 0 | 0 |  |
Long-term Debt, Fair Value | 446 | 591 |  |
Fair Value | Union Electric Company |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 7 | 8 |  |
Investments, Fair Value Disclosure | 248 | 248 |  |
Short-term Debt, Fair Value | 178 | 165 |  |
Long-term Debt, Fair Value | 5,352 | 6,321 |  |
Fair Value | Union Electric Company | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 7 | 8 |  |
Investments, Fair Value Disclosure | 0 | 0 |  |
Short-term Debt, Fair Value | 0 | 0 |  |
Long-term Debt, Fair Value | 0 | 0 |  |
Fair Value | Union Electric Company | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 0 | 0 |  |
Investments, Fair Value Disclosure | 248 | 248 |  |
Short-term Debt, Fair Value | 178 | 165 |  |
Long-term Debt, Fair Value | 5,352 | 6,321 |  |
Fair Value | Union Electric Company | Level 3 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 0 | 0 |  |
Investments, Fair Value Disclosure | 0 | 0 |  |
Short-term Debt, Fair Value | 0 | 0 |  |
Long-term Debt, Fair Value | 0 | 0 |  |
Fair Value | Ameren Illinois Company |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 166 | 133 |  |
Short-term Debt, Fair Value | 353 | 103 |  |
Long-term Debt, Fair Value | 3,868 | 4,971 |  |
Fair Value | Ameren Illinois Company | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 166 | 133 |  |
Short-term Debt, Fair Value | 0 | 0 |  |
Long-term Debt, Fair Value | 0 | 0 |  |
Fair Value | Ameren Illinois Company | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 0 | 0 |  |
Short-term Debt, Fair Value | 353 | 103 |  |
Long-term Debt, Fair Value | 3,868 | 4,971 |  |
Fair Value | Ameren Illinois Company | Level 3 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents, and restricted cash | 0 | 0 |  |
Short-term Debt, Fair Value | 0 | 0 |  |
Long-term Debt, Fair Value | $ 0 | $ 0 |  |

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