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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | $ 494 | $ 600
Ameren Missouri | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | 72 | 51
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 | 56 | 39
Ameren Illinois | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | 35 | 12
Ameren Illinois | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Income taxes payable to parent | 2 | 50
Ameren Illinois | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts receivable - affiliates | $ 22 | $ 0

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