Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Reconciliation of Income Tax Expense

The table below provides a reconciliation of income tax benefit computed at the federal statutory income tax rate to the income tax benefit:

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Loss from continuing operations before income taxes	$	(127	)	$	(156	)	$	(211	)	$	(290	)
Benefit for income taxes at federal statutory rate of 35%	$	(45	)	$	(54	)	$	(74	)	$	(101	)
Increase (decrease) in income tax from
State tax - net of federal benefit	(8		)	(5		)	(15		)	(18		)
Change in valuation allowance	48			—			105			—
Production tax credits, net	(21		)	(17		)	(42		)	(36		)
Taxes on income allocated to noncontrolling interests	(3		)	(5		)	(6		)	(4		)
Other	4			—			4			2
Total benefit for income taxes from continuing operations	$	(25	)	$	(81	)	$	(28	)	$	(157	)
Effective tax rate	20		%	52		%	13		%	54		%

The table below provides a reconciliation of income tax benefit computed at the federal statutory income tax rate to the income tax benefit:

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Loss before income taxes	$	(73	)	$	(69	)	$	(147	)	$	(83	)
Benefit for income taxes at federal statutory rate of 35%	$	(25	)	$	(24	)	$	(51	)	$	(29	)
Increase (decrease) in income tax from
State tax, net of federal benefit	(4		)	(3		)	(8		)	(4		)
Change in valuation allowance	30			—			60			—
Other	—			—			—			1
Total provision (benefit) for income taxes	$	1		$	(27	)	$	1		$	(32	)
Effective tax rate	*			39		%	*			39		%

* Not meaningful.