Income Taxes (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(in millions)	2012			2011
Income from continuing operations before income taxes	$	115		$	281
Provision for income tax at federal statutory rate of 35%	40			98
Increase (decrease) in income tax from:
State tax benefit – net of federal tax expense	(9		)	—
Production and housing credits	(19		)	(18		)
Property-related	(10		)	(11		)
Other	(2		)	(4		)
Total income tax expense from continuing operations	$	—		$	65
Effective tax rate	*			23		%

^*  Not meaningful