Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Components of net periodic cost (benefit)

Net Periodic Cost (Benefit)

Three months ended March 31
(In millions)	2012			2011
Pension cost
Service cost	$	3		$	4
Interest cost on projected benefit obligation	34			37
Expected return on plan assets	(43		)	(43		)
Amortization of net actuarial loss	10			6
Net periodic pension cost	$	4		$	4
Postretirement benefit
Interest cost on projected benefit obligation	$	—		$	1
Amortization of prior service credit	(4		)	(5		)
Amortization of net actuarial loss	—			1
Net periodic postretirement benefit	$	(4	)	$	(3	)