PENSION AND OTHER POSTEMPLOYMENT BENEFITS

The components of the consolidated net periodic costs (credits) for pension and OPEB (including amounts capitalized) were as follows:



Components of Net Periodic Benefit Costs (Credits)	Pension						OPEB
For the Three Months Ended September 30	2017			2016			2017			2016
	(In millions)
Service costs	$	52		$	48		$	1		$	2
Interest costs	97			99			7			7
Expected return on plan assets	(112		)	(100		)	(7		)	(7		)
Amortization of prior service costs (credits)	2			2			(20		)	(20		)
Net periodic costs (credits)	$	39		$	49		$	(19	)	$	(18	)



Components of Net Periodic Benefit Costs (Credits)	Pension						OPEB
For the Nine Months Ended September 30	2017			2016			2017			2016
	(In millions)
Service costs	$	156		$	144		$	3		$	4
Interest costs	291			298			21			22
Expected return on plan assets	(336		)	(297		)	(22		)	(23		)
Amortization of prior service costs (credits)	6			6			(60		)	(60		)
Net periodic costs (credits)	$	117		$	151		$	(58	)	$	(57	)

FES' share of the net periodic pension and OPEB costs (credits) were as follows:



	Pension				OPEB
	2017		2016		2017			2016
	(In millions)
For the Three Months Ended September 30	$	3	$	6	$	(4	)	$	(4	)
For the Nine Months Ended September 30	9		18		(12		)	(12		)

Pension and OPEB obligations are allocated to FE's subsidiaries, including FES, employing the plan participants. The net periodic pension and OPEB costs (credits), net of amounts capitalized, recognized in earnings by FirstEnergy and FES were as follows:



Net Periodic Benefit Expense (Credit)	Pension				OPEB
For the Three Months Ended September 30	2017		2016		2017			2016
	(In millions)
FirstEnergy	$	30	$	35	$	(14	)	$	(11	)
FES	3		5		(4		)	(4		)



Net Periodic Benefit Expense (Credit)	Pension				OPEB
For the Nine Months Ended September 30	2017		2016		2017			2016
	(In millions)
FirstEnergy	$	89	$	107	$	(43	)	$	(41	)
FES	9		17		(12		)	(12		)

As of September 30, 2017, and December 31, 2016, FES had $866 million of affiliated non-current liabilities related to allocated pension and OPEB mark-to-market costs, of which $570 million was from FENOC.