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Other Income, Net (Other Income And Expenses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other Nonoperating Income (Expense) [Line Items] |  |  |
Allowance for equity funds used during construction | $ 43 | $ 43 | $ 32
Interest income on industrial development revenue bonds | 24 | 25 | 25
Other interest income | 11 | 2 | 4
Non-service cost components of net periodic benefit income | 184 | 136 | 116
Miscellaneous income | 10 | 10 | 10
Equity in earnings of subsidiaries | 2 | 12 | 3
Donations | (26) | (9) | (25)
Miscellaneous expense | (22) | (17) | (14)
Total other income, net | 226 | 202 | 151
Union Electric Company |  |  |
Other Nonoperating Income (Expense) [Line Items] |  |  |
Allowance for equity funds used during construction | 24 | 26 | 19
Interest income on industrial development revenue bonds | 24 | 25 | 25
Other interest income | 4 | 1 | 1
Non-service cost components of net periodic benefit income | 55 | 55 | 46
Miscellaneous income | 4 | 3 | 4
Donations | (3) | (4) | (12)
Miscellaneous expense | (9) | (7) | (7)
Total other income, net | 99 | 99 | 76
Defined Benefit Plan, Non-service Cost or Income Components - Tracker | 22 | (7) | (4)
Union Electric Company | Final Rate Order | Electric |  |  |
Other Nonoperating Income (Expense) [Line Items] |  |  |
Donations |  | (8) |
Ameren Illinois Company |  |  |
Other Nonoperating Income (Expense) [Line Items] |  |  |
Allowance for equity funds used during construction | 18 | 17 | 13
Other interest income | 7 | 1 | 3
Non-service cost components of net periodic benefit income | 84 | 55 | 48
Miscellaneous income | 5 | 6 | 6
Donations | (8) | (5) | (5)
Miscellaneous expense | (10) | (8) | (6)
Total other income, net | $ 96 | $ 66 | $ 59

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