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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | $ 955 | $ 1,159
Accounts Receivable, Related Parties, Current | 597 | 600
Union Electric Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 85 | 43
Accounts Receivable, Related Parties, Current | 16 | 51
Union Electric Company | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 29 | 0
Union Electric Company | Income taxes receivable from parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | 0 | 39
Ameren Illinois Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 136 | 93
Accounts Receivable, Related Parties, Current | 11 | 12
Ameren Illinois Company | Income taxes payable to parent | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts Payable, Related Parties, Current | 81 | 50
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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