v3.25.2
Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 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 June 30, 2025, and December 31, 2024. As of June 30, 2025, these contracts extended through October 2028, October 2030 and May 2032 for fuel oils, natural gas, and power, respectively.
Quantity (in millions, except as indicated)
June 30, 2025December 31, 2024
CommodityAmeren MissouriAmeren IllinoisAmerenAmeren MissouriAmeren IllinoisAmeren
Fuel oils (in gallons)24 — 24 23 — 23 
Natural gas (in mmbtu)44 223 267 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 June 30, 2025, and December 31, 2024:
June 30, 2025December 31, 2024
Balance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Natural gasOther current assets2 4 6 2 2 4 
Other assets2 8 10 2 4 6 
PowerOther current assets13 — 13 6 — 6 
Total assets$17 $12 $29 $10 $6 $16 
Fuel oilsOther current liabilities$2 $— $2 $2 $— $2 
Other deferred credits and liabilities2 — 2 2 — 2 
Natural gasOther current liabilities4 16 20 5 22 27 
Other deferred credits and liabilities5 8 13 6 13 19 
PowerOther current liabilities— 10 10 — 10 10 
Other deferred credits and liabilities— 66 66 — 43 43 
Total liabilities$13 $100 $113 $15 $88 $103