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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Union Electric Company |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | $ 36 | $ 43
Accounts Receivable, Related Parties, Current | 70 | 51
Union Electric Company | Income taxes payable to parent |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 0 | 0
Union Electric Company | Income taxes receivable from parent |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | 54 | 39
Ameren Illinois Company |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 117 | 93
Accounts Receivable, Related Parties, Current | 14 | 12
Ameren Illinois Company | Income taxes payable to parent |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 80 | 50
Ameren Illinois Company | Income taxes receivable from parent |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 0 | $ 0

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