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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2022
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 2022, 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):
ElectricityFTRsNatural GasCoalDiesel Fuel
MWhsYearsMWhsYearsDthsYearsTonsYearsGallonsYears
Alliant Energy
8182022,202420,382 2022-2023234,755 2022-20302,216 2022-20231,512 2022
IPL4952022,20248,100 2022-2023132,019 2022-2030900 2022-2023— —
WPL323202212,282 2022-2023102,736 2022-20301,316 2022-20231,512 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,
2022		December 31,
2021		June 30,
2022		December 31,
2021		June 30,
2022		December 31,
2021
Current derivative assets$217$113$131$48$86$65
Non-current derivative assets1426376366627
Current derivative liabilities848584264
Non-current derivative liabilities1119—21
IPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 2022, 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):
ElectricityFTRsNatural GasCoalDiesel Fuel
MWhsYearsMWhsYearsDthsYearsTonsYearsGallonsYears
Alliant Energy
8182022,202420,382 2022-2023234,755 2022-20302,216 2022-20231,512 2022
IPL4952022,20248,100 2022-2023132,019 2022-2030900 2022-2023— —
WPL323202212,282 2022-2023102,736 2022-20301,316 2022-20231,512 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,
2022		December 31,
2021		June 30,
2022		December 31,
2021		June 30,
2022		December 31,
2021
Current derivative assets$217$113$131$48$86$65
Non-current derivative assets1426376366627
Current derivative liabilities848584264
Non-current derivative liabilities1119—21
WPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 2022, 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):
ElectricityFTRsNatural GasCoalDiesel Fuel
MWhsYearsMWhsYearsDthsYearsTonsYearsGallonsYears
Alliant Energy
8182022,202420,382 2022-2023234,755 2022-20302,216 2022-20231,512 2022
IPL4952022,20248,100 2022-2023132,019 2022-2030900 2022-2023— —
WPL323202212,282 2022-2023102,736 2022-20301,316 2022-20231,512 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,
2022		December 31,
2021		June 30,
2022		December 31,
2021		June 30,
2022		December 31,
2021
Current derivative assets$217$113$131$48$86$65
Non-current derivative assets1426376366627
Current derivative liabilities848584264
Non-current derivative liabilities1119—21