Related Parties (Tables)

6 Months Ended

Jun. 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 six months ended June 30 were as follows (in millions):

	IPL								WPL
	Three Months				Six Months				Three Months				Six Months
	2019		2018		2019		2018		2019		2018		2019		2018
Corporate Services billings		$47		$44		$90		$85		$35		$34		$68		$67
Sales credited	12		18		27		23		3		8		4		9
Purchases billed	74		80		158		173		29		20		59		37

Net Intercompany Payables

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

	IPL		WPL
	June 30, 2019	December 31, 2018	June 30, 2019	December 31, 2018
Net payables to Corporate Services	$108	$95	$72	$71

Related Amounts Billed Between Parties

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

	Three Months				Six Months
	2019		2018		2019		2018
ATC billings to WPL		$27		$26		$54		$53
WPL billings to ATC	3		3		7		5

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 six months ended June 30 were as follows (in millions):

	IPL								WPL
	Three Months				Six Months				Three Months				Six Months
	2019		2018		2019		2018		2019		2018		2019		2018
Corporate Services billings		$47		$44		$90		$85		$35		$34		$68		$67
Sales credited	12		18		27		23		3		8		4		9
Purchases billed	74		80		158		173		29		20		59		37

Net Intercompany Payables

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

	IPL		WPL
	June 30, 2019	December 31, 2018	June 30, 2019	December 31, 2018
Net payables to Corporate Services	$108	$95	$72	$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 six months ended June 30 were as follows (in millions):

	IPL								WPL
	Three Months				Six Months				Three Months				Six Months
	2019		2018		2019		2018		2019		2018		2019		2018
Corporate Services billings		$47		$44		$90		$85		$35		$34		$68		$67
Sales credited	12		18		27		23		3		8		4		9
Purchases billed	74		80		158		173		29		20		59		37

Net Intercompany Payables

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

	IPL		WPL
	June 30, 2019	December 31, 2018	June 30, 2019	December 31, 2018
Net payables to Corporate Services	$108	$95	$72	$71

Related Amounts Billed Between Parties

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

	Three Months				Six Months
	2019		2018		2019		2018
ATC billings to WPL		$27		$26		$54		$53
WPL billings to ATC	3		3		7		5