Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Income Tax Disclosure [Abstract]

Income Tax Provision (Benefit)

The income tax provision relating to continuing operations consists of the following: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
(millions)
Current	$	56		$	39		$	100		$	36
Deferred	59			48			100			54
Total Income Tax Provision	$	115		$	87		$	200		$	90
Effective Tax Rate	29		%	24		%	28		%	28		%