Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The following table provides the components of net periodic benefit cost for the plans:

	Pension Benefits
	Three Months Ended     June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
(In millions)
Service cost	$	2	$	4	$	4	$	8
Interest cost		32		32		64		64
Expected return on plan assets		(44)		(49)		(88)		(97)
Amortization of unrecognized net loss		12		12		23		23
Settlement charge		1				2
Net periodic benefit cost	$	3	$	(1)	$	5	$	(2)
	Other Postretirement Benefits
	Three Months Ended     June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
(In millions)
Interest cost					$	1	$	1
Expected return on plan assets	$	(1)	$	(1)		(2)		(2)
Amortization of unrecognized prior service benefit		(1)		(3)		(2)		(5)
Amortization of unrecognized net loss				1				1
Net periodic benefit cost	$	(2)	$	(3)	$	(3)	$	(5)