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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