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Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Accounts receivable - affiliates	$ 665	$ 525
Ameren Missouri | Related Party
Related Party Transaction [Line Items]
Accounts receivable - affiliates	15	40
Ameren Missouri | Income taxes payable to parent | Related Party
Related Party Transaction [Line Items]
Income taxes payable to parent	0	0
Ameren Missouri | Income taxes receivable from parent | Related Party
Related Party Transaction [Line Items]
Accounts receivable - affiliates	3	28
Ameren Illinois | Related Party
Related Party Transaction [Line Items]
Accounts receivable - affiliates	18	15
Ameren Illinois | Income taxes payable to parent | Related Party
Related Party Transaction [Line Items]
Income taxes payable to parent	4	32
Ameren Illinois | Income taxes receivable from parent | Related Party
Related Party Transaction [Line Items]
Accounts receivable - affiliates	$ 7	$ 0

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