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Schedule I - Condensed Financial Information Of Parent Other Income (Expense), Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other Nonoperating Income (Expense) [Line Items]      
Non-service cost components of net periodic benefit income $ 247 $ 304 $ 295
Donations (12) (5) (24)
Total other income (expense), net 347 417 348
Ameren (parent)      
Other Nonoperating Income (Expense) [Line Items]      
Non-service cost components of net periodic benefit income 1 4 8
Donations 0 0 (18)
Other expense, net (1) (1) (1)
Total other income (expense), net $ 0 $ 3 $ (11)