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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2021
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of September 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
13,265 2021-2022189,332 2021-20304,280 2021-20233,654 2021-2022
IPL4,014 2021-2022103,859 2021-20301,807 2021-2023— —
WPL9,251 2021-202285,473 2021-20302,473 2021-20233,654 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
September 30,
2021		December 31,
2020		September 30,
2021		December 31,
2020		September 30,
2021		December 31,
2020
Current derivative assets$158$24$72$20$86$4
Non-current derivative assets7810439351
Current derivative liabilities3933—6
Non-current derivative liabilities11619—7
IPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of September 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
13,265 2021-2022189,332 2021-20304,280 2021-20233,654 2021-2022
IPL4,014 2021-2022103,859 2021-20301,807 2021-2023— —
WPL9,251 2021-202285,473 2021-20302,473 2021-20233,654 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
September 30,
2021		December 31,
2020		September 30,
2021		December 31,
2020		September 30,
2021		December 31,
2020
Current derivative assets$158$24$72$20$86$4
Non-current derivative assets7810439351
Current derivative liabilities3933—6
Non-current derivative liabilities11619—7
WPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of September 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
13,265 2021-2022189,332 2021-20304,280 2021-20233,654 2021-2022
IPL4,014 2021-2022103,859 2021-20301,807 2021-2023— —
WPL9,251 2021-202285,473 2021-20302,473 2021-20233,654 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
September 30,
2021		December 31,
2020		September 30,
2021		December 31,
2020		September 30,
2021		December 31,
2020
Current derivative assets$158$24$72$20$86$4
Non-current derivative assets7810439351
Current derivative liabilities3933—6
Non-current derivative liabilities11619—7