Income Taxes (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Financial Statements [Abstract]

Income Tax Provision (Benefit)

The income tax provision consists of the following:

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
(millions)
Current	$	97		$	59		$	110		$	138
Deferred		34			57			44			85
Total Income Tax Provision	$	131		$	116		$	154		$	223
Effective Tax Rate		31	%		36	%		33	%		34	%