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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2023
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of September 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
1,6612023-202618,122 2023-2024180,519 2023-2032370 2023
IPL7462023-20268,078 2023-202485,457 2023-2030217 2023
WPL9152023-202610,044 2023-202495,062 2023-2032153 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
September 30,
2023		December 31,
2022		September 30,
2023		December 31,
2022		September 30,
2023		December 31,
2022
Current derivative assets$67$111$51$69$16$42
Non-current derivative assets6212634692857
Current derivative liabilities325915401719
Non-current derivative liabilities3420662814
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
September 30, 2023
Derivative assets$129$108$85$73$44$35
Derivative liabilities66452194536
December 31, 2022
Derivative assets2371931381089985
Derivative liabilities793546163319
IPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of September 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
1,6612023-202618,122 2023-2024180,519 2023-2032370 2023
IPL7462023-20268,078 2023-202485,457 2023-2030217 2023
WPL9152023-202610,044 2023-202495,062 2023-2032153 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
September 30,
2023		December 31,
2022		September 30,
2023		December 31,
2022		September 30,
2023		December 31,
2022
Current derivative assets$67$111$51$69$16$42
Non-current derivative assets6212634692857
Current derivative liabilities325915401719
Non-current derivative liabilities3420662814
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
September 30, 2023
Derivative assets$129$108$85$73$44$35
Derivative liabilities66452194536
December 31, 2022
Derivative assets2371931381089985
Derivative liabilities793546163319
WPL [Member]  
Derivative Instruments [Line Items]  
Notional Amounts Of Derivative Instruments As of September 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
1,6612023-202618,122 2023-2024180,519 2023-2032370 2023
IPL7462023-20268,078 2023-202485,457 2023-2030217 2023
WPL9152023-202610,044 2023-202495,062 2023-2032153 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
September 30,
2023		December 31,
2022		September 30,
2023		December 31,
2022		September 30,
2023		December 31,
2022
Current derivative assets$67$111$51$69$16$42
Non-current derivative assets6212634692857
Current derivative liabilities325915401719
Non-current derivative liabilities3420662814
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
September 30, 2023
Derivative assets$129$108$85$73$44$35
Derivative liabilities66452194536
December 31, 2022
Derivative assets2371931381089985
Derivative liabilities793546163319