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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | $ 647 | $ 1,136
Accounts Receivable, Related Parties, Current | 507 | 494
Union Electric Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 41 | 53
Accounts Receivable, Related Parties, Current | 47 | 72
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 | 32 | 56
Ameren Illinois Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 84 | 52
Accounts Receivable, Related Parties, Current | 14 | 35
Ameren Illinois Company | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 43 | 2
Ameren Illinois Company | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 0 | $ 22

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