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Consolidated Statement Of Cash Flows (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Interest Paid, Capitalized, Investing Activities | $ 26 | $ 17 | $ 16
Union Electric Company |  |  |
Interest Paid, Capitalized, Investing Activities | 13 | 10 | 10
Ameren Illinois Company |  |  |
Interest Paid, Capitalized, Investing Activities | $ 12 | $ 7 | $ 6

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