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Consolidated Statement Of Cash Flows (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Interest Paid, Capitalized, Investing Activities | $ 48 | $ 26 | $ 17
Proceeds from Income Tax Refunds | 49 | 0 | 0
Ameren Missouri |  |  |
Interest Paid, Capitalized, Investing Activities | 27 | 13 | 10
Proceeds from Income Tax Refunds | 49 | 0 | 0
Ameren Illinois |  |  |
Interest Paid, Capitalized, Investing Activities | $ 17 | $ 12 | $ 7

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