Related Parties (Tables)

6 Months Ended

Jun. 30, 2012

Related Party Transactions [Abstract]

Sales Credited And Purchases Billed

The sales credited to and purchases billed to IPL and WPL for the three and six months ended June 30 were as follows (in millions):

	IPL								WPL
	Three Months				Six Months				Three Months				Six Months
	2012		2011		2012		2011		2012		2011		2012		2011
Sales credited		$2		$12		$4		$20		$4		$10		$6		$16
Purchases billed	78		78		150		145		13		14		37		36

Corporate Services Billings

The amounts billed to IPL and WPL for the three and six months ended June 30 were as follows (in millions):

	IPL								WPL
	Three Months				Six Months				Three Months				Six Months
	2012		2011		2012		2011		2012		2011		2012		2011
Corporate Services billings		$34		$30		$63		$80		$27		$25		$50		$64

Net Intercompany Payables

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

	IPL				WPL
	June 30, 2012		December 31, 2011		June 30, 2012		December 31, 2011
Net payables to Corporate Services		$79		$82		$43		$48

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
	2012		2011		2012		2011
ATC billings to WPL		$23		$22		$45		$44
WPL billings to ATC	2		3		4		6