Income Taxes (Tables)

9 Months Ended

Sep. 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 September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
(millions)
Current	$	37		$	110		$	138		$	145
Deferred	74			98			174			152
Total Income Tax Provision	$	111		$	208		$	312		$	297
Effective Tax Rate	40		%	30		%	31		%	29		%