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Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 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 March 31, 2025, and December 31, 2024. As of March 31, 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)
March 31, 2025December 31, 2024
CommodityAmeren MissouriAmeren IllinoisAmerenAmeren MissouriAmeren IllinoisAmeren
Fuel oils (in gallons)24 — 24 23 — 23 
Natural gas (in mmbtu)47 221 268 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 March 31, 2025, and December 31, 2024:
March 31, 2025December 31, 2024
Balance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Natural gasOther current assets4 11 15 2 2 4 
Other assets2 5 7 2 4 6 
PowerOther current assets5 — 5 6 — 6 
Total assets$11 $16 $27 $10 $6 $16 
Fuel oilsOther current liabilities$2 $— $2 $2 $— $2 
Other deferred credits and liabilities1 — 1 2 — 2 
Natural gasOther current liabilities2 6 8 5 22 27 
Other deferred credits and liabilities7 14 21 6 13 19 
PowerOther current liabilities— 7 7 — 10 10 
Other deferred credits and liabilities— 60 60 — 43 43 
Total liabilities$12 $87 $99 $15 $88 $103