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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Union Electric Company |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | $ 43 | $ 46
Accounts Receivable, Related Parties, Current | 23 | 44
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 | 12 | 27
Ameren Illinois Company |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 117 | 64
Accounts Receivable, Related Parties, Current | 9 | 24
Ameren Illinois Company | Income taxes payable to parent |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 72 | 8
Ameren Illinois Company | Income taxes receivable from parent |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 0 | $ 18

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