Benefit Plans (Tables)

9 Months Ended

Sep. 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 September 30	Three Months						Nine Months
(In millions)	2012			2011			2012			2011
Pension cost (benefit)
Service cost	$	3		$	3		$	9		$	10
Interest cost on projected benefit obligation	34			37			101			110
Expected return on plan assets	(43		)	(44		)	(128		)	(130		)
Amortization of net actuarial (gain) loss	10			7			29			19
Net periodic pension cost (benefit)	$	4		$	3		$	11		$	9
Postretirement cost (benefit)
Interest cost on projected benefit obligation	$	1		$	1		$	2		$	3
Amortization of prior service credit	(4		)	(5		)	(13		)	(14		)
Net periodic postretirement cost (benefit)	$	(3	)	$	(4	)	$	(11	)	$	(11	)