Related Parties (Tables)

9 Months Ended

Sep. 30, 2019

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
	2019		2018		2019		2018		2019		2018		2019		2018
Corporate Services billings		$47		$43		$137		$128		$36		$33		$104		$100
Sales credited	23		11		50		34		2		7		6		16
Purchases billed	93		95		251		268		32		19		91		56

Net Intercompany Payables

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

	IPL		WPL
	September 30, 2019	December 31, 2018	September 30, 2019	December 31, 2018
Net payables to Corporate Services	$108	$95	$75	$71

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
	2019		2018		2019		2018
ATC billings to WPL		$28		$26		$82		$79
WPL billings to ATC	3		3		10		8

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
	2019		2018		2019		2018		2019		2018		2019		2018
Corporate Services billings		$47		$43		$137		$128		$36		$33		$104		$100
Sales credited	23		11		50		34		2		7		6		16
Purchases billed	93		95		251		268		32		19		91		56

Net Intercompany Payables

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

	IPL		WPL
	September 30, 2019	December 31, 2018	September 30, 2019	December 31, 2018
Net payables to Corporate Services	$108	$95	$75	$71

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
	2019		2018		2019		2018		2019		2018		2019		2018
Corporate Services billings		$47		$43		$137		$128		$36		$33		$104		$100
Sales credited	23		11		50		34		2		7		6		16
Purchases billed	93		95		251		268		32		19		91		56

Net Intercompany Payables

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

	IPL		WPL
	September 30, 2019	December 31, 2018	September 30, 2019	December 31, 2018
Net payables to Corporate Services	$108	$95	$75	$71

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
	2019		2018		2019		2018
ATC billings to WPL		$28		$26		$82		$79
WPL billings to ATC	3		3		10		8