Income Taxes (Tables)

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Tax Provision (Benefit)

The income tax provision consists of the following:

	Three Months Ended March 31,
	2012			2011
(millions)
Current	$	79		$	12
Deferred		32			11
Total Income Tax Provision	$	111		$	23
Effective Tax Rate		30	%		62	%