Related Parties (Tables)

9 Months Ended

Sep. 30, 2020

Related Party Transactions [Line Items]

Services Provided, Sales Credited And Purchases

The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):

	IPL								WPL
	Three Months				Nine Months				Three Months				Nine Months
	2020		2019		2020		2019		2020		2019		2020		2019
Corporate Services billings		$53		$47		$134		$137		$41		$36		$108		$104
Sales credited	10		23		35		50		—		2		4		6
Purchases billed	110		93		248		251		39		32		79		91

Net Intercompany Payables

Net intercompany payables to Corporate Services were as follows (in millions):

	IPL		WPL
	September 30, 2020	December 31, 2019	September 30, 2020	December 31, 2019
Net payables to Corporate Services	$119	$112	$77	$85

Related Amounts Billed Between Parties

The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):

	Three Months				Nine Months
	2020		2019		2020		2019
ATC billings to WPL		$27		$28		$80		$82
WPL billings to ATC	2		3		8		10

IPL [Member]

Related Party Transactions [Line Items]

Services Provided, Sales Credited And Purchases

The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):

	IPL								WPL
	Three Months				Nine Months				Three Months				Nine Months
	2020		2019		2020		2019		2020		2019		2020		2019
Corporate Services billings		$53		$47		$134		$137		$41		$36		$108		$104
Sales credited	10		23		35		50		—		2		4		6
Purchases billed	110		93		248		251		39		32		79		91

Net Intercompany Payables

Net intercompany payables to Corporate Services were as follows (in millions):

	IPL		WPL
	September 30, 2020	December 31, 2019	September 30, 2020	December 31, 2019
Net payables to Corporate Services	$119	$112	$77	$85

WPL [Member]

Related Party Transactions [Line Items]

Services Provided, Sales Credited And Purchases

The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):

	IPL								WPL
	Three Months				Nine Months				Three Months				Nine Months
	2020		2019		2020		2019		2020		2019		2020		2019
Corporate Services billings		$53		$47		$134		$137		$41		$36		$108		$104
Sales credited	10		23		35		50		—		2		4		6
Purchases billed	110		93		248		251		39		32		79		91

Net Intercompany Payables

Net intercompany payables to Corporate Services were as follows (in millions):

	IPL		WPL
	September 30, 2020	December 31, 2019	September 30, 2020	December 31, 2019
Net payables to Corporate Services	$119	$112	$77	$85

Related Amounts Billed Between Parties

The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):

	Three Months				Nine Months
	2020		2019		2020		2019
ATC billings to WPL		$27		$28		$80		$82
WPL billings to ATC	2		3		8		10