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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Derivative [Line Items]  
Notional Amounts of Derivative Instruments As of December 31, 2023, 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 Gas
MWhsYearsMWhsYearsDthsYears
Alliant Energy1,640 2024-202611,927 2024176,349 2024-2032
IPL673 2024-20265,336 202474,360 2024-2030
WPL967 2024-20266,591 2024101,989 2024-2032
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
202320222023202220232022
Current derivative assets$44$111$30$69$14$42
Non-current derivative assets4412624692057
Current derivative liabilities515922402919
Non-current derivative liabilities4720863914
Balance Sheet Offsetting However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets at December 31 as follows:
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
2023
Derivative assets$88$47$54$32$34$15
Derivative liabilities98573086849
2022
Derivative assets2371931381089985
Derivative liabilities793546163319
IPL [Member]  
Derivative [Line Items]  
Notional Amounts of Derivative Instruments As of December 31, 2023, 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 Gas
MWhsYearsMWhsYearsDthsYears
Alliant Energy1,640 2024-202611,927 2024176,349 2024-2032
IPL673 2024-20265,336 202474,360 2024-2030
WPL967 2024-20266,591 2024101,989 2024-2032
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
202320222023202220232022
Current derivative assets$44$111$30$69$14$42
Non-current derivative assets4412624692057
Current derivative liabilities515922402919
Non-current derivative liabilities4720863914
Balance Sheet Offsetting However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets at December 31 as follows:
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
2023
Derivative assets$88$47$54$32$34$15
Derivative liabilities98573086849
2022
Derivative assets2371931381089985
Derivative liabilities793546163319
WPL [Member]  
Derivative [Line Items]  
Notional Amounts of Derivative Instruments As of December 31, 2023, 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 Gas
MWhsYearsMWhsYearsDthsYears
Alliant Energy1,640 2024-202611,927 2024176,349 2024-2032
IPL673 2024-20265,336 202474,360 2024-2030
WPL967 2024-20266,591 2024101,989 2024-2032
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
202320222023202220232022
Current derivative assets$44$111$30$69$14$42
Non-current derivative assets4412624692057
Current derivative liabilities515922402919
Non-current derivative liabilities4720863914
Balance Sheet Offsetting However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets at December 31 as follows:
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
2023
Derivative assets$88$47$54$32$34$15
Derivative liabilities98573086849
2022
Derivative assets2371931381089985
Derivative liabilities793546163319