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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2023
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 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 GasCoal
MWhsYearsMWhsYearsDthsYearsTonsYears
Alliant Energy
1,1712023-202524,874 2023-2024192,421 2023-2032466 2023
IPL5372023-202510,163 2023-202492,087 2023-2030224 2023
WPL6342023-202514,711 2023-2024100,334 2023-2032242 2023
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,
2023		December 31,
2022		June 30,
2023		December 31,
2022		June 30,
2023		December 31,
2022
Current derivative assets$86$111$61$69$25$42
Non-current derivative assets6112634692757
Current derivative liabilities545927402719
Non-current derivative liabilities43201063314
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 as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
June 30, 2023
Derivative assets$147$114$95$73$52$41
Derivative liabilities976437156049
December 31, 2022
Derivative assets2371931381089985
Derivative liabilities793546163319
IPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 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 GasCoal
MWhsYearsMWhsYearsDthsYearsTonsYears
Alliant Energy
1,1712023-202524,874 2023-2024192,421 2023-2032466 2023
IPL5372023-202510,163 2023-202492,087 2023-2030224 2023
WPL6342023-202514,711 2023-2024100,334 2023-2032242 2023
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,
2023		December 31,
2022		June 30,
2023		December 31,
2022		June 30,
2023		December 31,
2022
Current derivative assets$86$111$61$69$25$42
Non-current derivative assets6112634692757
Current derivative liabilities545927402719
Non-current derivative liabilities43201063314
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 as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
June 30, 2023
Derivative assets$147$114$95$73$52$41
Derivative liabilities976437156049
December 31, 2022
Derivative assets2371931381089985
Derivative liabilities793546163319
WPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of June 30, 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 GasCoal
MWhsYearsMWhsYearsDthsYearsTonsYears
Alliant Energy
1,1712023-202524,874 2023-2024192,421 2023-2032466 2023
IPL5372023-202510,163 2023-202492,087 2023-2030224 2023
WPL6342023-202514,711 2023-2024100,334 2023-2032242 2023
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,
2023		December 31,
2022		June 30,
2023		December 31,
2022		June 30,
2023		December 31,
2022
Current derivative assets$86$111$61$69$25$42
Non-current derivative assets6112634692757
Current derivative liabilities545927402719
Non-current derivative liabilities43201063314
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 as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
June 30, 2023
Derivative assets$147$114$95$73$52$41
Derivative liabilities976437156049
December 31, 2022
Derivative assets2371931381089985
Derivative liabilities793546163319