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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2025, and December 31, 2024. As of September 30, 2025, these contracts extended through October 2028, October 2031 and May 2032 for fuel oils, natural gas, and power, respectively.
Quantity (in millions, except as indicated)
September 30, 2025December 31, 2024
CommodityAmeren MissouriAmeren IllinoisAmerenAmeren MissouriAmeren IllinoisAmeren
Fuel oils (in gallons)23 — 23 23 — 23 
Natural gas (in MMBtu)50 211 261 45 213 258 
Power (in MWhs)— 4 4 — 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 September 30, 2025, and December 31, 2024:
September 30, 2025December 31, 2024
Balance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Natural gasOther current assets$1 $3 $4 $2 $2 $4 
Other assets1 5 6 2 4 6 
PowerOther current assets22 — 22 6 — 6 
Total assets$24 $8 $32 $10 $6 $16 
Fuel oilsOther current liabilities$2 $— $2 $2 $— $2 
Other deferred credits and liabilities1 — 1 2 — 2 
Natural gasOther current liabilities3 18 21 5 22 27 
Other deferred credits and liabilities5 8 13 6 13 19 
PowerOther current liabilities1 10 11 — 10 10 
Other deferred credits and liabilities— 52 52 — 43 43 
Total liabilities$12 $88 $100 $15 $88 $103