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Other Income, Net (Tables) | 9 Months Ended
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Sep. 30, 2023
Other Nonoperating Income (Expense) [Abstract] |
Other Income And Expenses | The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three and nine months ended September 30, 2023 and 2022:
| Three Months |  | Nine Months |
| 2023 |  | 2022 |  | 2023 |  | 2022 |
Ameren: |  |  |  |  |  |  |  |
Allowance for equity funds used during construction | $ | 16 |  |  | $ | 12 |  |  | $ | 39 |  |  | $ | 31 |  |
Interest income on industrial development revenue bonds | — |  |  | 6 |  |  | 1 |  |  | 18 |  |
Other interest income | 6 |  |  | 2 |  |  | 23 |  |  | 6 |  |
Non-service cost components of net periodic benefit income(a) | 84 |  |  | 45 |  |  | 211 |  |  | 138 |  |
Miscellaneous income | 1 |  |  | 3 |  |  | 4 |  |  | 8 |  |
Earnings (losses) related to equity method investments | — |  |  | (3) |  |  | 2 |  |  | 1 |  |
Donations | (1) |  |  | (1) |  |  | (5) |  |  | (5) |  |
Miscellaneous expense | (5) |  |  | (6) |  |  | (14) |  |  | (17) |  |
Total Other Income, Net | $ | 101 |  |  | $ | 58 |  |  | $ | 261 |  |  | $ | 180 |  |
Ameren Missouri: |  |  |  |  |  |  |  |
Allowance for equity funds used during construction | $ | 8 |  |  | $ | 7 |  |  | $ | 20 |  |  | $ | 17 |  |
Interest income on industrial development revenue bonds | — |  |  | 6 |  |  | 1 |  |  | 18 |  |
Other interest income | 3 |  |  | 1 |  |  | 8 |  |  | 2 |  |
Non-service cost components of net periodic benefit income(a) | 34 |  |  | 13 |  |  | 62 |  |  | 41 |  |
Miscellaneous income | 1 |  |  | 1 |  |  | 3 |  |  | 3 |  |
Donations | — |  |  | — |  |  | (2) |  |  | (2) |  |
Miscellaneous expense | (2) |  |  | (3) |  |  | (7) |  |  | (7) |  |
Total Other Income, Net | $ | 44 |  |  | $ | 25 |  |  | $ | 85 |  |  | $ | 72 |  |
Ameren Illinois: |  |  |  |  |  |  |  |
Allowance for equity funds used during construction | $ | 5 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | 14 |  |
Interest income | 4 |  |  | 1 |  |  | 14 |  |  | 4 |  |
Non-service cost components of net periodic benefit income | 31 |  |  | 21 |  |  | 93 |  |  | 63 |  |
Miscellaneous income | — |  |  | 3 |  |  | 2 |  |  | 5 |  |
Donations | (1) |  |  | (1) |  |  | (3) |  |  | (3) |  |
Miscellaneous expense | (2) |  |  | (3) |  |  | (6) |  |  | (8) |  |
Total Other Income, Net | $ | 37 |  |  | $ | 26 |  |  | $ | 115 |  |  | $ | 75 |  |
(a)For the three and nine months ended September 30, 2023 the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $(2) million and $32 million, respectively, due to a regulatory tracking mechanism for the difference between the level of such costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. The deferral was $5 million and $16 million, respectively, for the three and nine months ended September 30, 2022. See Note 11 – Retirement Benefits for additional information.

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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