Newly Adopted Accounting Standards (Tables)

12 Months Ended

Dec. 31, 2015

Presentation Of Debt Issuance Costs [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in PHI’s consolidated balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 835			December 31, 2014 As Adjusted
	(millions of dollars)
Other (within other assets)	$	166	$	(45	)	$	121
Long-term debt		4,441		(44	)		4,397
Transition bonds issued by ACE Funding		171		(1	)		170

Balance Sheet Classification Of Deferred Taxes [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in PHI’s consolidated balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 740			December 31, 2014 As Adjusted
	(millions of dollars)
Deferred income taxes, net (within current assets)	$	50	$	(50	)	$	—
Deferred income taxes, net (within other assets)		—		17			17
Other (within current liabilities)		314		(9	)		305
Deferred income tax liabilities, net		3,266		(24	)		3,242

Atlantic City Electric Co [Member] | Presentation Of Debt Issuance Costs [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in ACE’s consolidated balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 835			December 31, 2014 As Adjusted
	(millions of dollars)
Other (within other assets)	$	12	$	(7	)	$	5
Long-term debt		888		(6	)		882
Transition bonds issued by ACE Funding		171		(1	)		170

Atlantic City Electric Co [Member] | Balance Sheet Classification Of Deferred Taxes [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in ACE’s consolidated balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 740			December 31, 2014 As Adjusted
	(millions of dollars)
Prepaid expenses and other	$	13	$	(10	)	$	3
Deferred income tax liabilities, net		865		(10	)		855

Potomac Electric Power Co [Member] | Presentation Of Debt Issuance Costs [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in Pepco’s balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 835			December 31, 2014 As Adjusted
	(millions of dollars)
Other (within other assets)	$	71	$	(28	)	$	43
Long-term debt		2,124		(28	)		2,096

Potomac Electric Power Co [Member] | Balance Sheet Classification Of Deferred Taxes [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in Pepco’s balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 740			December 31, 2014 As Adjusted
	(millions of dollars)
Deferred income taxes, net (within current assets)	$	14	$	(14	)	$	—
Other (within current liabilities)		102		(9	)		93
Deferred income tax liabilities, net		1,584		(5	)		1,579

Delmarva Power & Light Co/De [Member] | Presentation Of Debt Issuance Costs [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in DPL’s balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 835			December 31, 2014 As Adjusted
	(millions of dollars)
Other (within other assets)	$	12	$	(8	)	$	4
Long-term debt		971		(8	)		963

Delmarva Power & Light Co/De [Member] | Balance Sheet Classification Of Deferred Taxes [Member]

Effects of the Retrospective Application of Newly Adopted Accounting Standards on Reported Balances

The table below illustrates the effects of the retrospective application on reported balances in DPL’s balance sheet as of December 31, 2014.

	December 31, 2014 As Filed		Reclassification ASC 740			December 31, 2014 As Adjusted
	(millions of dollars)
Deferred income taxes, net (within current assets)	$	16	$	(16	)	$	—
Other (within current liabilities)		42		(1	)		41
Deferred income tax liabilities, net		893		(15	)		878