Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 30, 2020, 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):

	FTRs		Natural Gas		Coal		Diesel Fuel
	MWhs	Years	Dths	Years	Tons	Years	Gallons	Years
Alliant Energy	14,365	2020-2021	218,581	2020-2028	8,151	2020-2023	6,174	2020-2022
IPL	5,401	2020-2021	114,747	2020-2028	3,373	2020-2023	—	—
WPL	8,964	2020-2021	103,834	2020-2027	4,778	2020-2023	6,174	2020-2022

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 Energy				IPL				WPL
	September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019
Current derivative assets		$33		$16		$23		$12		$10		$4
Non-current derivative assets	15		11		11		10		4		1
Current derivative liabilities	6		19		2		9		4		10
Non-current derivative liabilities	13		19		6		9		7		10

IPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 30, 2020, 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):

	FTRs		Natural Gas		Coal		Diesel Fuel
	MWhs	Years	Dths	Years	Tons	Years	Gallons	Years
Alliant Energy	14,365	2020-2021	218,581	2020-2028	8,151	2020-2023	6,174	2020-2022
IPL	5,401	2020-2021	114,747	2020-2028	3,373	2020-2023	—	—
WPL	8,964	2020-2021	103,834	2020-2027	4,778	2020-2023	6,174	2020-2022

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 Energy				IPL				WPL
	September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019
Current derivative assets		$33		$16		$23		$12		$10		$4
Non-current derivative assets	15		11		11		10		4		1
Current derivative liabilities	6		19		2		9		4		10
Non-current derivative liabilities	13		19		6		9		7		10

WPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 30, 2020, 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):

	FTRs		Natural Gas		Coal		Diesel Fuel
	MWhs	Years	Dths	Years	Tons	Years	Gallons	Years
Alliant Energy	14,365	2020-2021	218,581	2020-2028	8,151	2020-2023	6,174	2020-2022
IPL	5,401	2020-2021	114,747	2020-2028	3,373	2020-2023	—	—
WPL	8,964	2020-2021	103,834	2020-2027	4,778	2020-2023	6,174	2020-2022

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 Energy				IPL				WPL
	September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019		September 30, 2020		December 31, 2019
Current derivative assets		$33		$16		$23		$12		$10		$4
Non-current derivative assets	15		11		11		10		4		1
Current derivative liabilities	6		19		2		9		4		10
Non-current derivative liabilities	13		19		6		9		7		10