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Long-Term Debt And Equity Financings (Schedule Of Maturities Of Long-Term Debt) (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
2023 | $ 340,000,000 |
2024 | 849,000,000 |
2025 | 300,000,000 |
2026 | 350,000,000 |
2027 | 950,000,000 |
Thereafter | 11,358,000,000 |
Total | 14,147,000,000 |
Ameren (parent) |  |
Debt Instrument [Line Items] |  |
2023 | 0 |
2024 | 450,000,000 |
2025 | 0 |
2026 | 350,000,000 |
2027 | 500,000,000 |
Thereafter | 1,250,000,000 |
Total | 2,550,000,000 |
Debt Instrument, Unamortized Discount or Premium and Debt Issuance Costs | 14,000,000 |
Union Electric Company |  |
Debt Instrument [Line Items] |  |
2023 | 240,000,000 |
2024 | 350,000,000 |
2025 | 0 |
2026 | 0 |
2027 | 400,000,000 |
Thereafter | 5,149,000,000 |
Total | 6,139,000,000 |
Debt Instrument, Unamortized Discount or Premium and Debt Issuance Costs | 53,000,000 |
Ameren Illinois Company |  |
Debt Instrument [Line Items] |  |
2023 | 100,000,000 |
2024 | 0 |
2025 | 300,000,000 |
2026 | 0 |
2027 | 0 |
Thereafter | 4,488,000,000 |
Total | 4,888,000,000 |
Debt Instrument, Unamortized Discount or Premium and Debt Issuance Costs | 53,000,000 |
Ameren Transmission Company of Illinois |  |
Debt Instrument [Line Items] |  |
2023 | 0 |
2024 | 49,000,000 |
2025 | 0 |
2026 | 0 |
2027 | 50,000,000 |
Thereafter | 471,000,000 |
Total | 570,000,000 |
Debt Instrument, Unamortized Discount or Premium and Debt Issuance Costs | 2,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 2.45% Due 2036 |  |
Debt Instrument [Line Items] |  |
Debt instrument face amount | 75,000,000 | $ 75,000,000
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 2.45% Due 2036 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Thereafter | 30,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 2.45% Due 2036 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Thereafter | 45,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 |  |
Debt Instrument [Line Items] |  |
2023 | 50,000,000 |
Debt instrument face amount | 400,000,000 | $ 450,000,000
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
2025 | 49,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Thereafter | 50,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Thereafter | 49,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Five |  |
Debt Instrument [Line Items] |  |
Thereafter | 50,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Six |  |
Debt Instrument [Line Items] |  |
Thereafter | 49,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Seven |  |
Debt Instrument [Line Items] |  |
Thereafter | 77,000,000 |
Unsecured Debt | Ameren Transmission Company of Illinois | Senior Unsecured Notes, 3.43%, Due 2050 | Debt Instrument, Redemption, Period Eight |  |
Debt Instrument [Line Items] |  |
Thereafter | $ 76,000,000 |

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