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Related Parties (Tables)

3 Months Ended

Mar. 31, 2013

The sales credited to and purchases billed to IPL and WPL for the three months ended March 31 were as follows (in millions):

The amounts billed to IPL and WPL for the three months ended March 31 were as follows (in millions):



	IPL				WPL
	2013		2012		2013		2012
Corporate Services billings		$32		$29		$26		$23

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



	IPL		WPL
	March 31, 2013	December 31, 2012	March 31, 2013	December 31, 2012
Net payables to Corporate Services	$79	$72	$42	$40

The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):

IPL [Member]

The sales credited to and purchases billed to IPL and WPL for the three months ended March 31 were as follows (in millions):

The amounts billed to IPL and WPL for the three months ended March 31 were as follows (in millions):



	IPL				WPL
	2013		2012		2013		2012
Corporate Services billings		$32		$29		$26		$23

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



	IPL		WPL
	March 31, 2013	December 31, 2012	March 31, 2013	December 31, 2012
Net payables to Corporate Services	$79	$72	$42	$40

WPL [Member]

The sales credited to and purchases billed to IPL and WPL for the three months ended March 31 were as follows (in millions):

The amounts billed to IPL and WPL for the three months ended March 31 were as follows (in millions):



	IPL				WPL
	2013		2012		2013		2012
Corporate Services billings		$32		$29		$26		$23

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



	IPL		WPL
	March 31, 2013	December 31, 2012	March 31, 2013	December 31, 2012
Net payables to Corporate Services	$79	$72	$42	$40

The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):