Related Parties (Tables)

9 Months Ended

Sep. 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 nine months ended September 30 were as follows (in millions):

	IPL								WPL
	Three Months				Nine Months				Three Months				Nine Months
	2012		2011		2012		2011		2012		2011		2012		2011
Sales credited		$3		$6		$7		$26		$4		$7		$10		$23
Purchases billed	87		93		237		238		13		20		50		56

Corporate Services Billings

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

	IPL								WPL
	Three Months				Nine Months				Three Months				Nine Months
	2012		2011		2012		2011		2012		2011		2012		2011
Corporate Services billings		$34		$37		$97		$117		$26		$29		$76		$93

Net Intercompany Payables

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

	IPL				WPL
	September 30, 2012		December 31, 2011		September 30, 2012		December 31, 2011
Net payables to Corporate Services		$80		$82		$49		$48

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
	2012		2011		2012		2011
ATC billings to WPL		$22		$23		$67		$67
WPL billings to ATC	3		2		7		8