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Long-Term Debt and Equity Financings (Schedule of Required and Actual Debt Ratios) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)
Ameren Missouri
Debt Instrument [Line Items]
Bonds Issuable	$ 3,777
Preferred Stock Issuable Based On Coverage Ratio	3,702
Retired Bond Capacity	$ 895
Ameren Missouri | Actual Interest Coverage Ratio
Debt Instrument [Line Items]
Interest Coverage Ratio	3.2
Dividend Coverage Ratio	219.0
Ameren Illinois
Debt Instrument [Line Items]
Bonds Issuable	$ 9,482
Preferred Stock Issuable Based On Coverage Ratio	203
Retired Bond Capacity	$ 1,093
Ameren Illinois | Actual Interest Coverage Ratio
Debt Instrument [Line Items]
Interest Coverage Ratio	6.6
Dividend Coverage Ratio	3.6
Minimum | Ameren Missouri | Required Dividend Coverage Ratio
Debt Instrument [Line Items]
Interest Coverage Ratio	2.0
Dividend Coverage Ratio	2.5
Minimum | Ameren Illinois | Required Dividend Coverage Ratio
Debt Instrument [Line Items]
Interest Coverage Ratio	2.0
Dividend Coverage Ratio	1.5

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