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Consolidated Statement Of Cash Flows (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Interest Paid, Capitalized, Investing Activity | $ 52 | $ 56 | $ 48
Proceeds from Income Tax Refunds | 314 | 95 | 49
Ameren Missouri |  |  |
Interest Paid, Capitalized, Investing Activity | 36 | 39 | 27
Proceeds from Income Tax Refunds | 314 | 95 | 49
Ameren Illinois |  |  |
Interest Paid, Capitalized, Investing Activity | $ 15 | $ 15 | $ 17

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