Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

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				Six Months Ended				Three Months Ended				Six Months Ended
	June 30,				June 30,				June 30,				June 30,
(In millions)	2016		2015		2016		2015		2016		2015		2016		2015
Service cost	$	1	$	-	$	1	$	1	$	-	$	-	$	-	$	-
Interest cost		49		49		99		97		2		2		5		5
Expected long-term return on plan assets		(62)		(67)		(124)		(133)		-		-		-		-
Amortization of:
Net loss from past experience		16		18		33		35		-		-		-		-
Prior service cost		-		-		-		-		-		-		(1)		(1)
Net cost	$	4	$	-	$	9	$	-	$	2	$	2	$	4	$	4