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Schedule I - Condensed Financial Information Of Parent Other Income (Expense), Net (Details) - USD ($) $ in Millions | 12 Months Ended
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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)

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