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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | $ 702 | $ 1,059
Accounts Receivable, Related Parties, Current | 667 | 525
Union Electric Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 42 | 50
Accounts Receivable, Related Parties, Current | 44 | 40
Union Electric Company | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 0 | 0
Union Electric Company | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | 29 | 28
Ameren Illinois Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 71 | 74
Accounts Receivable, Related Parties, Current | 22 | 15
Ameren Illinois Company | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 32 | 32
Ameren Illinois Company | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 0 | $ 0

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