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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023 and 2022. As of December 31, 2023, these contracts extended through October 2026, October 2029, May 2032, and March 2024 for fuel oils, natural gas, power, and uranium, respectively.
Quantity (in millions, except as indicated)
20232022
CommodityAmeren MissouriAmeren
Illinois		AmerenAmeren MissouriAmeren
Illinois		Ameren
Fuel oils (in gallons)17 — 17 18 — 18 
Natural gas (in mmbtu)53 218 271 48 157 205 
Power (in MWhs)— 5 5 1 6 7 
Uranium (pounds in thousands)186 — 186 514 — 514 
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 December 31, 2023 and 2022:
20232022
CommodityBalance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Fuel oilsOther current assets$2 $— $2 $13 $— $13 
Other assets— — — 3 — 3 
Natural gasOther current assets— — — 7 23 30 
Other assets3 3 6 9 11 20 
PowerOther current assets5 — 5 14 2 16 
 Other assets— — — — 4 4 
UraniumOther current assets9 — 9 2 — 2 
Other assets— — — 1 — 1 
 Total assets$19 $3 $22 $49 $40 $89 
Fuel oilsOther current liabilities$1 $— $1 $— $— $— 
Other deferred credits and liabilities1 — 1 — — — 
Natural gasOther current liabilities12 45 57 7 20 27 
Other deferred credits and liabilities10 30 40 2 9 11 
PowerOther current liabilities1 12 13 59 2 61 
Other deferred credits and liabilities— 56 56 — 37 37 
 Total liabilities$25 $143 $168 $68 $68 $136 
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 December 31, 2023 and 2022:
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
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 
2022
Assets:
Ameren Missouri$49 $9 $— $40 
Ameren Illinois40 20 — 20 
Ameren$89 $29 $— $60 
Liabilities:
Ameren Missouri$68 $9 $56 $3 
Ameren Illinois68 20 — 48 
Ameren$136 $29 $56 $51 
(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 Credit Risk Related Contingent Features The following table presents, as of December 31, 2023, 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$24 $— $19 
Ameren Illinois74 6 66 
Ameren$98 $6 $85 
(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.