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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | $ 525 | $ 494
Ameren Missouri | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | 40 | 72
Ameren Missouri | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Income taxes payable to parent | 0 | 0
Ameren Missouri | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | 28 | 56
Ameren Illinois | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | 15 | 35
Ameren Illinois | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Income taxes payable to parent | 32 | 2
Ameren Illinois | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | $ 0 | $ 22

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