Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

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,
	2013			2012			2013			2012
(millions)
Current	$	71		$	56		$	108		$	100
Deferred	57			59			106			100
Total Income Tax Provision	$	128		$	115		$	214		$	200
Effective Tax Rate	26.4		%	29.5		%	26.6		%	27.6		%