Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Components of net defined benefit plan costs

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended				Three Months Ended
	March 31,				March 31,
(In millions)	2017		2016		2017		2016
Interest cost	$	48	$	50	$	3	$	3
Expected long-term return on plan assets		(65)		(62)		-		-
Amortization of:
Net loss from past experience		16		17		-		-
Prior service cost		-		-		(1)		(1)
Settlement loss		6		-		-		-
Net cost	$	5	$	5	$	2	$	2