Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Schedule of Components of Other Comprehensive Loss

The components of Pepco Holdings’ AOCL are as follows. For additional information, see the consolidated statements of comprehensive income.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
	(millions of dollars)
Balance at beginning of the period	$	(42	)	$	(35	)	$	(46	)	$	(34	)
Treasury Lock
Balance at beginning of the period		(9	)		(9	)		(9	)		(9	)
Amount of pre-tax loss reclassified to Interest expense		1			—			1			—
Income tax benefit		—			—			—			—
Balance as of September 30		(8	)		(9	)		(8	)		(9	)
Pension and Other Postretirement Benefits
Balance at beginning of the period		(33	)		(26	)		(37	)		(25	)
Amount of amortization of net prior service cost and actuarial loss reclassified to Other operation and maintenance expense		2			2			7			—
Income tax expense (benefit)		2			—			3			(1	)
Balance as of September 30		(33	)		(24	)		(33	)		(24	)
Balance as of September 30	$	(41	)	$	(33	)	$	(41	)	$	(33	)