Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of net periodic cost (benefit)

Net Periodic Cost (Benefit)

Periods ended June 30	Three Months						Six Months
(In millions)	2012			2011			2012			2011
Pension cost (benefit)
Service cost	$	3		$	3		$	6		$	7
Interest cost on projected benefit obligation	33			36			67			73
Expected return on plan assets	(42		)	(43		)	(85		)	(86		)
Amortization of net actuarial (gain) loss	9			6			19			12
Net periodic pension cost (benefit)	$	3		$	2		$	7		$	6
Postretirement cost (benefit)
Interest cost on projected benefit obligation	$	1		$	1		$	1		$	2
Amortization of prior service credit	(5		)	(4		)	(9		)	(9		)
Amortization of net actuarial (gain) loss	—			(1		)	—			—
Net periodic postretirement cost (benefit)	$	(4	)	$	(4	)	$	(8	)	$	(7	)