Defined Benefit Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2017

Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following summarizes the components of net periodic benefit cost:

	Three Months Ended September 30,
	Pension Benefits						Other Benefits
(In millions)	2017			2016			2017			2016
Service cost	$	5		$	6		$	—		$	1
Interest cost	7			9			2			3
Expected return on plan assets	(10		)	(12		)	—			—
Amortization:
– prior service cost (credit)	(3		)	(2		)	(2		)	(1		)
– actuarial loss	3			4			—			—
Net settlement loss (a)	8			14			—			—
Net periodic benefit cost	$	10		$	19		$	—		$	3

	Nine Months Ended September 30,
	Pension Benefits						Other Benefits
(In millions)	2017			2016			2017			2016
Service cost	$	16		$	18		$	1		$	3
Interest cost	22			30			6			8
Expected return on plan assets	(32		)	(40		)	—			—
Amortization:
– prior service cost (credit)	(7		)	(7		)	(5		)	(3		)
– actuarial loss	7			11			—			—
Net settlement loss (a)	25			93			—			—
Net periodic benefit cost	$	31		$	105		$	2		$	8

^(a)  Settlements are recognized as they occur, once it is probable that lump sum payments from a plan for a given year will exceed the plan’s total service and interest cost for that year.