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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020, and December 31, 2019. As of September 30, 2020, these contracts extended through October 2023, October 2025, May 2032 and March 2023 for fuel oils, natural gas, power and uranium, respectively.
Quantity (in millions, except as indicated)
September 30, 2020December 31, 2019
CommodityAmeren MissouriAmeren IllinoisAmerenAmeren MissouriAmeren IllinoisAmeren
Fuel oils (in gallons)44 — 44 58 — 58 
Natural gas (in mmbtu)32 123 155 20 136 156 
Power (in megawatthours)6 7 13 5 7 12 
Uranium (pounds in thousands)365 — 365 565 — 565 
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 September 30, 2020, and December 31, 2019:
September 30, 2020December 31, 2019
Balance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Fuel oilsOther current assets$2 $— $2 $4 $— $4 
Other assets— — — 2 — 2 
Natural gasOther current assets2 10 12 — 3 3 
Other assets2 4 6 — 1 1 
PowerOther current assets12 — 12 14 — 14 
Other assets1 — 1 2 — 2 
Total assets$19 $14 $33 $22 $4 $26 
Fuel oilsOther current liabilities$14 $— $14 $4 $— $4 
Other deferred credits and liabilities6 — 6 3 — 3 
Natural gasOther current liabilities— 2 2 1 12 13 
Other deferred credits and liabilities— 1 1 1 6 7 
PowerOther current liabilities6 16 22 2 17 19 
Other deferred credits and liabilities4 197 201 1 207 208 
UraniumOther deferred credits and liabilities— — — 1 — 1 
Total liabilities$30 $216 $246 $13 $242 $255