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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Derivative [Line Items]  
Notional Amounts of Derivative Instruments As of December 31, 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 Energy9,135 2022191,670 2022-20303,193 2022-20233,024 2022
IPL2,647 2022100,560 2022-20301,270 2022-2023— —
WPL6,488 202291,110 2022-20301,923 2022-20233,024 2022
Fair Value of Financial Instruments At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
202120202021202020212020
Current derivative assets$113$24$48$20$65$4
Non-current derivative assets6310369271
Current derivative liabilities894346
Non-current derivative liabilities116—917
IPL [Member]  
Derivative [Line Items]  
Notional Amounts of Derivative Instruments As of December 31, 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 Energy9,135 2022191,670 2022-20303,193 2022-20233,024 2022
IPL2,647 2022100,560 2022-20301,270 2022-2023— —
WPL6,488 202291,110 2022-20301,923 2022-20233,024 2022
Fair Value of Financial Instruments At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
202120202021202020212020
Current derivative assets$113$24$48$20$65$4
Non-current derivative assets6310369271
Current derivative liabilities894346
Non-current derivative liabilities116—917
WPL [Member]  
Derivative [Line Items]  
Notional Amounts of Derivative Instruments As of December 31, 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 Energy9,135 2022191,670 2022-20303,193 2022-20233,024 2022
IPL2,647 2022100,560 2022-20301,270 2022-2023— —
WPL6,488 202291,110 2022-20301,923 2022-20233,024 2022
Fair Value of Financial Instruments At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
202120202021202020212020
Current derivative assets$113$24$48$20$65$4
Non-current derivative assets6310369271
Current derivative liabilities894346
Non-current derivative liabilities116—917