Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Income Tax Disclosure [Abstract]

Reconciliation of Income Tax Expense

The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision.

	Three months ended June 30,						Six months ended June 30,
(in millions)	2012			2011			2012			2011
Income from continuing operations before income taxes	$	104		$	254		$	218		$	535
Provision for income tax at federal statutory rate of 35%	36			89			76			187
Increase (decrease) in income tax from:
State tax benefit – net of federal tax expense	2			6			(7		)	8
Production and housing credits	(17		)	(19		)	(36		)	(36		)
Property-related	(10		)	(10		)	(19		)	(21		)
Other	(10		)	(4		)	(12		)	(11		)
Total income tax expense from continuing operations	$	1		$	62		$	2		$	127
Effective tax rate	1		%	24		%	1		%	24		%