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Other Income, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Other Nonoperating Income (Expense) [Line Items] |  |  |  |
Allowance for equity funds used during construction | $ 11 | $ 9 | $ 19 | $ 16
Interest income on industrial development revenue bonds | 6 | 6 | 12 | 12
Non-service cost components of net periodic benefit income | 47 | 34 | 93 | 68
Miscellaneous income | 6 | 7 | 13 | 12
Donations | (2) | (1) | (4) | (4)
Miscellaneous expense | (6) | (6) | (11) | (9)
Total Other Income, Net | 62 | 49 | 122 | 95
Union Electric Company |  |  |  |
Other Nonoperating Income (Expense) [Line Items] |  |  |  |
Allowance for equity funds used during construction | 6 | 6 | 10 | 10
Interest income on industrial development revenue bonds | 6 | 6 | 12 | 12
Non-service cost components of net periodic benefit income | 14 | 14 | 28 | 28
Miscellaneous income | 1 | 0 | 3 | 1
Donations | (1) | (1) | (2) | (1)
Miscellaneous expense | (2) | (1) | (4) | (3)
Total Other Income, Net | 24 | 24 | 47 | 47
Defined Benefit Plan, Non-service Cost or Income Components - Tracker | 5 |  | 11 | (3)
Ameren Illinois Company |  |  |  |
Other Nonoperating Income (Expense) [Line Items] |  |  |  |
Allowance for equity funds used during construction | 5 | 3 | 9 | 6
Non-service cost components of net periodic benefit income | 21 | 14 | 42 | 28
Miscellaneous income | 3 | 3 | 5 | 4
Donations | (1) | 0 | (2) | (3)
Miscellaneous expense | (3) | (4) | (5) | (5)
Total Other Income, Net | $ 25 | $ 16 | $ 49 | $ 30

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