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Other Income, Net (Tables) | 12 Months Ended
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Dec. 31, 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 years ended December 31, 2023, 2022, and 2021:
| 2023 |  | 2022 |  | 2021 |
Ameren: |  |  |  |  |  |
Other Income, Net |  |  |  |  |  |
Allowance for equity funds used during construction | $ | 54 |  |  | $ | 43 |  |  | $ | 43 |  |
Interest income on industrial development revenue bonds | 1 |  |  | 24 |  |  | 25 |  |
Other interest income | 32 |  |  | 11 |  |  | 2 |  |
Non-service cost components of net periodic benefit income(a) | 295 |  |  | 184 |  |  | 136 |  |
Miscellaneous income | 7 |  |  | 10 |  |  | 10 |  |
Earnings related to equity method investments | 1 |  |  | 2 |  |  | 12 |  |
Donations | (24) |  |  | (26) |  |  | (9) |  |
Miscellaneous expense | (18) |  |  | (22) |  |  | (17) |  |
Total Other Income, Net | $ | 348 |  |  | $ | 226 |  |  | $ | 202 |  |
Ameren Missouri: |  |  |  |  |  |
Other Income, Net |  |  |  |  |  |
Allowance for equity funds used during construction | $ | 30 |  |  | $ | 24 |  |  | $ | 26 |  |
Interest income on industrial development revenue bonds | 1 |  |  | 24 |  |  | 25 |  |
Other interest income | 10 |  |  | 4 |  |  | 1 |  |
Non-service cost components of net periodic benefit income(a) | 97 |  |  | 55 |  |  | 55 |  |
Miscellaneous income | 3 |  |  | 4 |  |  | 3 |  |
Donations | (2) |  |  | (3) |  |  | (4) |  |
Miscellaneous expense | (9) |  |  | (9) |  |  | (7) |  |
Total Other Income, Net | $ | 130 |  |  | $ | 99 |  |  | $ | 99 |  |
Ameren Illinois: |  |  |  |  |  |
Other Income, Net |  |  |  |  |  |
Allowance for equity funds used during construction | $ | 19 |  |  | $ | 18 |  |  | $ | 17 |  |
Interest income | 21 |  |  | 7 |  |  | 1 |  |
Non-service cost components of net periodic benefit income | 124 |  |  | 84 |  |  | 55 |  |
Miscellaneous income | 4 |  |  | 5 |  |  | 6 |  |
Donations | (4) |  |  | (8) |  |  | (5) |  |
Miscellaneous expense | (8) |  |  | (10) |  |  | (8) |  |
Total Other Income, Net | $ | 156 |  |  | $ | 96 |  |  | $ | 66 |  |
(a)For the years ended December 31, 2023, 2022, and 2021, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $27 million, $22 million, and $(7) 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 following table presents the components of “Total Other Expense, Net” in the Condensed Statement of Income and Comprehensive Income for the years ended December 31, 2023, 2022, and 2021:
(In millions) | 2023 |  | 2022 |  | 2021
Total Other Expense, Net |  |  |  |  |
Non-service cost components of net periodic benefit income | $ | 8 |  |  | $ | 3 |  |  | $ | 1 |
Donations | (18) |  |  | (15) |  |  | — |
Other expense, net | (1) |  |  | (1) |  |  | (1) |
Total Other Expense, Net | $ | (11) |  |  | $ | (13) |  |  | $ | — |

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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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