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Related Parties (Tables)

6 Months Ended

Jun. 30, 2013

Related Party Transaction [Line Items]

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
	2013				2012				2013				2012				2013				2012				2013				2012
Sales credited		$1				$2				$3				$4				$4				$4				$7				$6
Purchases billed	76				78				152				150				14				13				28				37

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
	2013				2012				2013				2012				2013				2012				2013				2012
Corporate Services billings		$36				$34				$68				$63				$23				$27				$49				$50

Net Intercompany Payables

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

	IPL				WPL
	June 30, 2013		December 31, 2012		June 30, 2013		December 31, 2012
Net payables to Corporate Services	$73		$72		$39		$40

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
	2013				2012				2013				2012
ATC billings to WPL		$24				$23				$48				$45
WPL billings to ATC	4				2				7				4

IPL [Member]

Related Party Transaction [Line Items]

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
	2013				2012				2013				2012				2013				2012				2013				2012
Sales credited		$1				$2				$3				$4				$4				$4				$7				$6
Purchases billed	76				78				152				150				14				13				28				37

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
	2013				2012				2013				2012				2013				2012				2013				2012
Corporate Services billings		$36				$34				$68				$63				$23				$27				$49				$50

Net Intercompany Payables

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

	IPL				WPL
	June 30, 2013		December 31, 2012		June 30, 2013		December 31, 2012
Net payables to Corporate Services	$73		$72		$39		$40

WPL [Member]

Related Party Transaction [Line Items]

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
	2013				2012				2013				2012				2013				2012				2013				2012
Sales credited		$1				$2				$3				$4				$4				$4				$7				$6
Purchases billed	76				78				152				150				14				13				28				37

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
	2013				2012				2013				2012				2013				2012				2013				2012
Corporate Services billings		$36				$34				$68				$63				$23				$27				$49				$50

Net Intercompany Payables

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

	IPL				WPL
	June 30, 2013		December 31, 2012		June 30, 2013		December 31, 2012
Net payables to Corporate Services	$73		$72		$39		$40

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
	2013				2012				2013				2012
ATC billings to WPL		$24				$23				$48				$45
WPL billings to ATC	4				2				7				4

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