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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2021
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 2021, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
FTRsNatural GasCoalDiesel Fuel
MWhsYearsDthsYearsTonsYearsGallonsYears
Alliant Energy
16,242 2021-2022179,960 2021-20285,148 2021-20234,284 2021-2022
IPL4,936 2021-202294,049 2021-20281,946 2021-2023— —
WPL11,306 2021-202285,911 2021-20273,202 2021-20234,284 2021-2022
Fair Value Of Financial Instruments Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPL
June 30,
2021		December 31,
2020		June 30,
2021		December 31,
2020		June 30,
2021		December 31,
2020
Current derivative assets$77$24$41$20$36$4
Non-current derivative assets2510159101
Current derivative liabilities1913—6
Non-current derivative liabilities3161927
IPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 2021, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
FTRsNatural GasCoalDiesel Fuel
MWhsYearsDthsYearsTonsYearsGallonsYears
Alliant Energy
16,242 2021-2022179,960 2021-20285,148 2021-20234,284 2021-2022
IPL4,936 2021-202294,049 2021-20281,946 2021-2023— —
WPL11,306 2021-202285,911 2021-20273,202 2021-20234,284 2021-2022
Fair Value Of Financial Instruments Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPL
June 30,
2021		December 31,
2020		June 30,
2021		December 31,
2020		June 30,
2021		December 31,
2020
Current derivative assets$77$24$41$20$36$4
Non-current derivative assets2510159101
Current derivative liabilities1913—6
Non-current derivative liabilities3161927
WPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 2021, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
FTRsNatural GasCoalDiesel Fuel
MWhsYearsDthsYearsTonsYearsGallonsYears
Alliant Energy
16,242 2021-2022179,960 2021-20285,148 2021-20234,284 2021-2022
IPL4,936 2021-202294,049 2021-20281,946 2021-2023— —
WPL11,306 2021-202285,911 2021-20273,202 2021-20234,284 2021-2022
Fair Value Of Financial Instruments Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPL
June 30,
2021		December 31,
2020		June 30,
2021		December 31,
2020		June 30,
2021		December 31,
2020
Current derivative assets$77$24$41$20$36$4
Non-current derivative assets2510159101
Current derivative liabilities1913—6
Non-current derivative liabilities3161927