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Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2024, and December 31, 2023. As of March 31, 2024, these contracts extended through October 2026, October 2029 and May 2032 for fuel oils, natural gas and power, respectively.
Quantity (in millions)
March 31, 2024December 31, 2023
CommodityAmeren MissouriAmeren IllinoisAmerenAmeren MissouriAmeren IllinoisAmeren
Fuel oils (in gallons)17 — 17 17 — 17 
Natural gas (in mmbtu)54 224 278 53 218 271 
Power (in MWhs)— 5 5 — 5 5 
Uranium (pounds in thousands)— — — 186 — 186 
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, as of March 31, 2024, and December 31, 2023:
March 31, 2024December 31, 2023
Balance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Fuel oilsOther current assets$2 $— $2 $2 $— $2 
Natural gasOther current assets— 2 2 — — — 
Other assets3 2 5 3 3 6 
PowerOther current assets2 — 2 5 — 5 
UraniumOther current assets— — — 9 — 9 
Total assets$7 $4 $11 $19 $3 $22 
Fuel oilsOther current liabilities$1 $— $1 $1 $— $1 
Other deferred credits and liabilities— — — 1 — 1 
Natural gasOther current liabilities11 43 54 12 45 57 
Other deferred credits and liabilities8 28 36 10 30 40 
PowerOther current liabilities— 11 11 1 12 13 
Other deferred credits and liabilities— 43 43 — 56 56 
Total liabilities$20 $125 $145 $25 $143 $168 
Offsetting Assets and Liabilities
The following table provides the recognized gross derivative balances and the net amounts of those derivatives subject to an enforceable master netting arrangement or similar agreement as of March 31, 2024, and December 31, 2023:
Gross Amounts Not Offset in the Balance Sheet
Commodity Contracts Eligible to be OffsetGross Amounts Recognized in the Balance SheetDerivative Instruments
Cash Collateral Received/Posted(a)
Net Amount
March 31, 2024
Assets:
Ameren Missouri$7 $5 $— $2 
Ameren Illinois4 2 — 2 
Ameren$11 $7 $— $4 
Liabilities:
Ameren Missouri$20 $5 $— $15 
Ameren Illinois125 2 1 122 
Ameren$145 $7 $1 $137 
December 31, 2023
Assets:
Ameren Missouri$19 $6 $— $13 
Ameren Illinois3 1 — 2 
Ameren$22 $7 $— $15 
Liabilities:
Ameren Missouri$25 $6 $— $19 
Ameren Illinois143 1 6 136 
Ameren$168 $7 $6 $155 
(a)Cash collateral received reduces gross asset balances and is included in “Other current liabilities” and “Other deferred credits and liabilities” on the balance sheet. Cash collateral posted reduces gross liability balances and is included in “Current collateral assets” and “Other assets” on the balance sheet for Ameren and Ameren Missouri and “Other current assets” and “Other assets” for Ameren Illinois.
Derivative Instruments With Credit Risk-Related Contingent Features The following table presents, as of March 31, 2024, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of additional collateral that counterparties could require:
Aggregate Fair Value of
Derivative Liabilities(a)
Cash
Collateral Posted
Potential Aggregate Amount of
Additional Collateral Required(b)
Ameren Missouri$20 $— $15 
Ameren Illinois71 1 68 
Ameren$91 $1 $83 
(a)Before consideration of master netting arrangements or similar agreements.
(b)As collateral requirements with certain counterparties are based on master netting arrangements or similar agreements, the aggregate amount of additional collateral required to be posted is determined after consideration of the effects of such arrangements.