Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Costs

The table below provides the components of net periodic benefit costs recognized by Pepco Holdings for the three months ended September 30, 2015 and 2014:

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
	(millions of dollars)
Service cost	$	15		$	12		$	2		$	1
Interest cost		28			27			6			7
Expected return on plan assets		(35	)		(36	)		(6	)		(6	)
Amortization of prior service cost (benefit)		—			1			(3	)		(2	)
Amortization of net actuarial loss		16			12			2			—
Net periodic benefit cost	$	24		$	16		$	1		$	—

The table below provides the components of net periodic benefit costs recognized by Pepco Holdings for the nine months ended September 30, 2015 and 2014:

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
	(millions of dollars)
Service cost	$	43		$	33		$	5		$	5
Interest cost		82			82			18			20
Expected return on plan assets		(105	)		(107	)		(17	)		(18	)
Amortization of prior service cost (benefit)		1			2			(9	)		(9	)
Amortization of net actuarial loss		49			34			6			2
Net periodic benefit cost	$	70		$	44		$	3		$	—