Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Cash and cash equivalents	$ 25	$ 14
Restricted cash equivalents	14	25
Accounts receivable, less allowance for uncollectible accounts	839	782
Inventories	141	141
Income taxes and related accrued interest receivable	111	9
Prepaid expenses and other	72	63
Total Current Assets	1,202	1,034
OTHER ASSETS
Goodwill	1,406	1,407
Regulatory assets	2,246	2,409
Deferred income tax assets, net	15	17
Income taxes and related accrued interest receivable	6	81
Restricted cash equivalents	18	14
Other	129	121
Total Other Assets	3,820	4,049
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	16,218	15,465
Accumulated depreciation	(4,914)	(4,959)
Net Property, Plant and Equipment	11,304	10,506
TOTAL ASSETS	16,326	15,589
CURRENT LIABILITIES
Short-term debt	1,063	729
Current portion of long-term debt and project funding	341	431
Current portion of long-term debt	294	366
Accounts payable	175	174
Accrued liabilities	322	313
Capital lease obligations due within one year	11	10
Taxes accrued	51	41
Interest accrued	49	47
Liabilities and accrued interest related to uncertain tax positions	9	6
Other	287	305
Total Current Liabilities	2,308	2,056
DEFERRED CREDITS
Regulatory liabilities	308	343
Deferred income tax liabilities, net	3,393	3,242
Investment tax credits	15	16
Pension benefit obligation	466	396
Other postretirement benefit obligations	215	265
Other	202	195
Total Deferred Credits	4,599	4,457
OTHER LONG-TERM LIABILITIES
Long-term debt	4,656	4,397
Transition bonds issued by ACE Funding	124	170
Long-term project funding	4	8
Capital lease obligations	39	50
Total Other Long-Term Liabilities	$ 4,823	$ 4,625
COMMITMENTS AND CONTINGENCIES
PREFERRED STOCK
Series A preferred stock, $.01 par value, 18,000 shares authorized, 18,000 and 12,600 shares outstanding, respectively	$ 183	$ 129
EQUITY
Common stock	3	3
Premium on stock and other capital contributions	3,829	3,800
Accumulated other comprehensive loss	(36)	(46)
Retained earnings	617	565
Total Equity	4,413	4,322
TOTAL LIABILITIES AND EQUITY	16,326	15,589
Potomac Electric Power Co [Member]
CURRENT ASSETS
Cash and cash equivalents	5	6
Restricted cash equivalents	2	5
Accounts receivable, less allowance for uncollectible accounts	346	315
Inventories	67	62
Income taxes and related accrued interest receivable	170	94
Prepaid expenses and other	20	21
Total Current Assets	610	503
OTHER ASSETS
Regulatory assets	720	697
Prepaid pension expense	291	316
Investment in trust	27	34
Income taxes and related accrued interest receivable	3	30
Other	42	43
Total Other Assets	1,083	1,120
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	8,091	7,764
Accumulated depreciation	(2,799)	(2,816)
Net Property, Plant and Equipment	5,292	4,948
TOTAL ASSETS	6,985	6,571
CURRENT LIABILITIES
Short-term debt	64	104
Current portion of long-term debt and project funding		12
Accounts payable	87	94
Accrued liabilities	101	91
Accounts payable due to associated companies	30	30
Capital lease obligations due within one year	11	10
Taxes accrued	37	32
Interest accrued	22	19
Liabilities and accrued interest related to uncertain tax positions	3
Customer deposits	46	44
Other	68	93
Total Current Liabilities	469	529
DEFERRED CREDITS
Regulatory liabilities	92	104
Deferred income tax liabilities, net	1,721	1,579
Investment tax credits	2	2
Other postretirement benefit obligations	49	57
Other	72	67
Total Deferred Credits	1,936	1,809
OTHER LONG-TERM LIABILITIES
Long-term debt	2,301	2,096
Capital lease obligations	39	50
Total Other Long-Term Liabilities	$ 2,340	$ 2,146
COMMITMENTS AND CONTINGENCIES
EQUITY
Premium on stock and other capital contributions	$ 1,122	$ 1,010
Retained earnings	1,118	1,077
Total Equity	2,240	2,087
TOTAL LIABILITIES AND EQUITY	6,985	6,571
Delmarva Power & Light Co/De [Member]
CURRENT ASSETS
Cash and cash equivalents	5	4
Restricted cash equivalents		5
Accounts receivable, less allowance for uncollectible accounts	203	193
Inventories	50	55
Income taxes and related accrued interest receivable	58	34
Prepaid expenses and other	10	12
Total Current Assets	326	303
OTHER ASSETS
Goodwill	8	8
Regulatory assets	308	356
Prepaid pension expense	205	220
Income taxes and related accrued interest receivable		4
Other	1	4
Total Other Assets	522	592
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	4,209	3,946
Accumulated depreciation	(1,046)	(1,021)
Net Property, Plant and Equipment	3,163	2,925
TOTAL ASSETS	4,011	3,820
CURRENT LIABILITIES
Short-term debt	210	211
Current portion of long-term debt	100	100
Accounts payable	41	39
Accrued liabilities	76	74
Accounts payable due to associated companies	20	17
Taxes accrued	3	3
Interest accrued	7	7
Customer deposits	31	24
Other	39	41
Total Current Liabilities	527	516
DEFERRED CREDITS
Regulatory liabilities	189	225
Deferred income tax liabilities, net	941	878
Investment tax credits	4	4
Other postretirement benefit obligations	19	21
Other	33	35
Total Deferred Credits	1,186	1,163
OTHER LONG-TERM LIABILITIES
Long-term debt	$ 1,061	$ 963
COMMITMENTS AND CONTINGENCIES
EQUITY
Premium on stock and other capital contributions	$ 612	$ 537
Retained earnings	625	641
Total Equity	1,237	1,178
TOTAL LIABILITIES AND EQUITY	4,011	3,820
Atlantic City Electric Co [Member]
CURRENT ASSETS
Cash and cash equivalents	3	2
Restricted cash equivalents	12	10
Accounts receivable, less allowance for uncollectible accounts	211	167
Inventories	23	23
Income taxes and related accrued interest receivable	199	151
Prepaid expenses and other	1	3
Total Current Assets	449	356
OTHER ASSETS
Regulatory assets	322	427
Prepaid pension expense	83	96
Income taxes and related accrued interest receivable		34
Restricted cash equivalents	18	14
Other	4	5
Total Other Assets	427	576
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment	3,305	3,073
Accumulated depreciation	(764)	(760)
Net Property, Plant and Equipment	2,541	2,313
TOTAL ASSETS	3,417	3,245
CURRENT LIABILITIES
Short-term debt	5	127
Current portion of long-term debt and project funding	48	59
Current portion of long-term debt	2	15
Accounts payable	25	20
Accrued liabilities	106	103
Accounts payable due to associated companies	16	15
Taxes accrued	22	1
Interest accrued	13	13
Customer deposits	30	21
Other	21	22
Total Current Liabilities	286	381
DEFERRED CREDITS
Regulatory liabilities	27	14
Deferred income tax liabilities, net	888	855
Investment tax credits	4	5
Other postretirement benefit obligations	33	36
Other	18	16
Total Deferred Credits	970	926
OTHER LONG-TERM LIABILITIES
Long-term debt	1,030	882
Transition bonds issued by ACE Funding	124	170
Total Other Long-Term Liabilities	$ 1,154	$ 1,052
COMMITMENTS AND CONTINGENCIES
EQUITY
Common stock	$ 26	$ 26
Premium on stock and other capital contributions	746	651
Retained earnings	235	209
Total Equity	1,007	886
TOTAL LIABILITIES AND EQUITY	$ 3,417	$ 3,245