Debt (Tables)

3 Months Ended

Mar. 31, 2022

Short-term Debt [Line Items]

Other Short-Term Borrowings

Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2022	Alliant Energy	IPL	WPL
Amount outstanding	$276	$—	$157
Weighted average interest rates	0.6%	N/A	0.5%
Available credit facility capacity	$724	$250	$143

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2022	2021	2022	2021	2022	2021
Maximum amount outstanding (based on daily outstanding balances)	$577	$578	$—	$—	$252	$275
Average amount outstanding (based on daily outstanding balances)	$443	$424	$—	$—	$205	$189
Weighted average interest rates	0.3%	0.2%	—%	—%	0.3%	0.2%

IPL [Member]

Short-term Debt [Line Items]

Other Short-Term Borrowings

Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2022	Alliant Energy	IPL	WPL
Amount outstanding	$276	$—	$157
Weighted average interest rates	0.6%	N/A	0.5%
Available credit facility capacity	$724	$250	$143

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2022	2021	2022	2021	2022	2021
Maximum amount outstanding (based on daily outstanding balances)	$577	$578	$—	$—	$252	$275
Average amount outstanding (based on daily outstanding balances)	$443	$424	$—	$—	$205	$189
Weighted average interest rates	0.3%	0.2%	—%	—%	0.3%	0.2%

WPL [Member]

Short-term Debt [Line Items]

Other Short-Term Borrowings

Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2022	Alliant Energy	IPL	WPL
Amount outstanding	$276	$—	$157
Weighted average interest rates	0.6%	N/A	0.5%
Available credit facility capacity	$724	$250	$143

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2022	2021	2022	2021	2022	2021
Maximum amount outstanding (based on daily outstanding balances)	$577	$578	$—	$—	$252	$275
Average amount outstanding (based on daily outstanding balances)	$443	$424	$—	$—	$205	$189
Weighted average interest rates	0.3%	0.2%	—%	—%	0.3%	0.2%