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Other Income, Net (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Other Nonoperating Income (Expense) [Line Items] |  |
Allowance for equity funds used during construction | $ 9 | $ 9
Other interest income | 8 | 8
Non-service cost components of net periodic benefit income | 76 | 64
Miscellaneous income | 2 | 2
Income (Loss) from Equity Method Investments | 0 | 2
Donations | (2) | (2)
Miscellaneous expense | (4) | (5)
Total Other Income, Net | 89 | 78
Union Electric Company |  |
Other Nonoperating Income (Expense) [Line Items] |  |
Allowance for equity funds used during construction | 9 | 4
Other interest income | 2 | 4
Non-service cost components of net periodic benefit income | 35 | 14
Miscellaneous income | 1 | 1
Donations | (1) | (1)
Miscellaneous expense | (2) | (3)
Total Other Income, Net | 44 | 19
Defined Benefit Plan, Non-service Cost or Income Components - Tracker | (9) | 17
Ameren Illinois Company |  |
Other Nonoperating Income (Expense) [Line Items] |  |
Allowance for equity funds used during construction | 0 | 4
Other interest income | 6 | 4
Non-service cost components of net periodic benefit income | 27 | 31
Miscellaneous income | 1 | 1
Donations | (1) | (1)
Miscellaneous expense | (2) | (2)
Total Other Income, Net | $ 31 | $ 37

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