Retirement Plans

3 Months Ended

Mar. 31, 2015

Compensation And Retirement Disclosure [Abstract]

Retirement Plans

7.  Retirement Plans

Components of net periodic pension cost consisted of the following:

	Three Months Ended
	March 31,
	2015			2014
	(In millions)
Service cost	$	17		$	12
Interest cost		26			25
Expected return on plan assets		(42	)		(40	)
Amortization of unrecognized net actuarial losses		19			8
Pension expense	$	20		$	5

In 2015, the Corporation expects to contribute approximately $55 million to its funded pension plans.  Through March 31, 2015, the Corporation contributed approximately $13 million of this amount.