Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 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				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
(In millions)	2017		2016		2017		2016		2017		2016		2017		2016
Service cost	$	-	$	-	$	1	$	1	$	-	$	-	$	-	$	-
Interest cost		47		50		140		149		2		3		7		8
Expected long-term return on plan assets		(66)		(62)		(195)		(186)		-		-		-		-
Amortization of:
Net loss from past experience		16		17		49		50		-		-		-		-
Prior service cost		-		-		-		-		-		(1)		(1)		(2)
Settlement loss		-		-		6		-		-		-		-		-
Net cost	$	(3)	$	5	$	1	$	14	$	2	$	2	$	6	$	6