Pension and Other Postemployment Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

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 March 31,	2018			2017			2018			2017
	(In millions)
Service costs	$	56		$	52		$	1		$	1
Interest costs	93			97			6			7
Expected return on plan assets	(144		)	(112		)	(8		)	(8		)
Amortization of prior service costs (credits)	2			2			(20		)	(20		)
Net periodic costs (credits)	$	7		$	39		$	(21	)	$	(20	)

Net Periodic Pension and OPEB Costs

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

Net Periodic Benefit Expense (Credit)	Pension					OPEB
For the Three Months Ended March 31,	2018			2017		2018			2017
	(In millions)
FirstEnergy	$	(14	)	$	32	$	(21	)	$	(15	)