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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 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 June 30, 2020, and December 31, 2019. As of June 30, 2020, these contracts extended through October 2023, March 2024, May 2032 and March 2023 for fuel oils, natural gas, power and uranium, respectively.
Quantity (in millions, except as indicated)
June 30, 2020December 31, 2019
CommodityAmeren MissouriAmeren IllinoisAmerenAmeren MissouriAmeren IllinoisAmeren
Fuel oils (in gallons)53  —  53  58  —  58  
Natural gas (in mmbtu)25  137  162  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 June 30, 2020, and December 31, 2019:
June 30, 2020December 31, 2019
Balance Sheet LocationAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Fuel oilsOther current assets$2  $—  $2  $4  $—  $4  
Other assets1  —  1  2  —  2  
Natural gasOther current assets—  3  3  —  3  3  
Other assets1  2  3  —  1  1  
PowerOther current assets17  —  17  14  —  14  
Other assets2  —  2  2  —  2  
UraniumOther assets1  —  1  —  —  —  
Total assets$24  $5  $29  $22  $4  $26  
Fuel oilsOther current liabilities$15  $—  $15  $4  $—  $4  
Other deferred credits and liabilities8  —  8  3  —  3  
Natural gasOther current liabilities2  10  12  1  12  13  
Other deferred credits and liabilities—  3  3  1  6  7  
PowerOther current liabilities2  18  20  2  17  19  
Other deferred credits and liabilities2  211  213  1  207  208  
UraniumOther deferred credits and liabilities—  —  —  1  —  1  
Total liabilities$29  $242  $271  $13  $242  $255