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Consolidated Balance Sheet - AIC (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts receivable - trade, allowance for doubtful accounts | $ 39 | $ 30
Common stock, shares authorized | 400,000,000.0 | 400,000,000.0
Common Stock, Shares, Outstanding | 276,400,000 | 269,900,000
Ameren Illinois |  |
Accounts receivable - trade, allowance for doubtful accounts | $ 22 | $ 18
Common Stock, No Par Value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized | 45,000,000.0 | 45,000,000.0
Common Stock, Shares, Outstanding | 25,500,000 | 25,500,000

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