Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 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 June 30, 2015 and 2014:

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
	(millions of dollars)
Service cost	$	14		$	9		$	1		$	2
Interest cost		27			28			6			6
Expected return on plan assets		(35	)		(36	)		(5	)		(6	)
Amortization of prior service cost (benefit)		1			1			(3	)		(4	)
Amortization of net actuarial loss		17			11			1			(1	)
Net periodic benefit cost	$	24		$	13		$	—		$	(3	)

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

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
	(millions of dollars)
Service cost	$	28		$	21		$	3		$	4
Interest cost		54			55			12			13
Expected return on plan assets		(70	)		(71	)		(11	)		(12	)
Amortization of prior service cost (benefit)		1			1			(6	)		(7	)
Amortization of net actuarial loss		33			22			4			2
Net periodic benefit cost	$	46		$	28		$	2		$	—