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Short-Term Debt And Liquidity (Narrative) (Details) $ in Billions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024	Sep. 30, 2025 USD ($)	Sep. 30, 2024
Credit Agreements
Short-term Debt [Line Items]
Net Liquidity Available	$ 1.6		$ 1.6
Actual debt-to-capital ratio	0.61		0.61
Utilities
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate, over Time	4.53%	5.29%	4.56%	5.37%
Union Electric Company | Missouri Credit Agreement
Short-term Debt [Line Items]
Actual debt-to-capital ratio	0.49		0.49
Ameren Illinois Company | Illinois Credit Agreement
Short-term Debt [Line Items]
Actual debt-to-capital ratio	0.45		0.45

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