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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Open Gross Derivative Volumes By Commodity Type
The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of December 31, 2025 and 2024. As of December 31, 2025, these contracts extended through October 2029, October 2031, and May 2032 for fuel oils, natural gas, and power, respectively.
Quantity (in millions, except as indicated)
20252024
CommodityAmeren MissouriAmeren
Illinois		AmerenAmeren MissouriAmeren
Illinois		Ameren
Fuel oils (in gallons)25 — 25 23 — 23 
Natural gas (in mmbtu)46 217 263 45 213 258 
Power (in MWhs)— 7 7 — 4 4 
Derivative Instruments Carrying Value
The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments because all qualify for regulatory deferral, as of December 31, 2025 and 2024:
20252024
CommodityBalance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Natural gasOther current assets$1 $1 $2 $2 $2 $4 
Other assets— 3 3 2 4 6 
PowerOther current assets11 — 11 6 — 6 
 Total assets$12 $4 $16 $10 $6 $16 
Fuel oilsOther current liabilities$3 $— $3 $2 $— $2 
Other deferred credits and liabilities2 — 2 2 — 2 
Natural gasOther current liabilities5 21 26 5 22 27 
Other deferred credits and liabilities5 11 16 6 13 19 
PowerOther current liabilities— 24 24 — 10 10 
Other deferred credits and liabilities— 55 55 — 43 43 
 Total liabilities$15 $111 $126 $15 $88 $103