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Schedule I - Condensed Financial Information Of Parent Other Income (Expense), Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Nonoperating Income (Expense) [Line Items] |  |  |
Non-service cost components of net periodic benefit income | $ 295 | $ 184 | $ 136
Donations | (24) | (26) | (9)
Total other expense, net | 348 | 226 | 202
Ameren (parent) |  |  |
Other Nonoperating Income (Expense) [Line Items] |  |  |
Non-service cost components of net periodic benefit income | 8 | 3 | 1
Donations | (18) | (15) | 0
Other expense, net | (1) | (1) | (1)
Total other expense, net | (11) | $ (13) | $ 0
Non-state-regulated money pool advances | $ 10 |  |

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