Provision (Benefit) for Income Taxes (Tables)

9 Months Ended

Sep. 30, 2013

Income Tax Expense (Benefit), Continuing Operations [Abstract]

Provision (benefit) for income taxes from continuing operations

	Three months ended   September 30,					Nine months ended    September 30,
	2013		2012			2013			2012
	(Millions)					(Millions)
Current:
Federal	$	25	$	58		$	(47	)	$	112
State	—		10			3			18
Foreign	2		6			3			30
	27		74			(41		)	160
Deferred:
Federal	21		6			233			123
State	9		(3		)	41			(9		)
Foreign	5		—			27			7
	35		3			301			121
Total provision (benefit)	$	62	$	77		$	260		$	281