Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt instrument, carrying value	$ 5,001	$ 4,817
Net unamortized discount	(2)	(10)
Unamortized debt issuance costs	(49)	(44)
Current portion of long-term debt	(294)	(366)
Total net long-term debt	4,656	4,397
Total long-term debt	5,001	4,817
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	4,424	3,889
Total long-term debt	4,424	3,889
Medium-Term Notes [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	40	40
Total long-term debt	40	40
Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	456	806
Total long-term debt	456	806
Transition Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	171	215
Unamortized debt issuance costs	(1)	(1)
Current portion of long-term debt	(46)	(44)
Total Net Long-Term Debt	124	170
Total long-term debt	$ 171	215
3.05% Due 2022 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.05%
Debt instrument maturity date	2022
Debt instrument, carrying value	$ 200	200
Total long-term debt	$ 200	200
6.20% Due 2022 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.20%
Debt instrument maturity date	2022
Debt instrument, carrying value	$ 110	110
Total long-term debt	$ 110	110
3.60% Due 2024 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.60%
Debt instrument maturity date	2024
Debt instrument, carrying value	$ 400	400
Total long-term debt	$ 400	400
5.75% Due 2034 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.75%
Debt instrument maturity date	2034
Debt instrument, carrying value	$ 100	100
Total long-term debt	$ 100	100
5.40% Due 2035 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.40%
Debt instrument maturity date	2035
Debt instrument, carrying value	$ 175	175
Total long-term debt	$ 175	175
6.50% Due 2037 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.50%
Debt instrument maturity date	2037
Debt instrument, carrying value	$ 500	500
Total long-term debt	$ 500	500
7.90% Due 2038 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.90%
Debt instrument maturity date	2038
Debt instrument, carrying value	$ 250	250
Total long-term debt	$ 250	250
4.15% Due 2043 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.15%
Debt instrument maturity date	2043
Debt instrument, carrying value	$ 450	250
Total long-term debt	$ 450	250
4.95% Due 2043 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.95%
Debt instrument maturity date	2043
Debt instrument, carrying value	$ 150	150
Total long-term debt	150	150
4.91% Due 2017 [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value		17
Total long-term debt		17
5.05% Due 2020 [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	39	51
Total long-term debt	39	51
5.55% Due 2023 [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	132	147
Total long-term debt	$ 132	147
2.70% Due 2015 [Member] \| Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	2.70%
Debt instrument maturity date	2015
Debt instrument, carrying value		250
Total long-term debt		250
5.90% Due 2016 [Member] \| Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.90%
Debt instrument maturity date	2016
Debt instrument, carrying value	$ 190	190
Total long-term debt	$ 190	190
6.125% Due 2017 [Member] \| Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.125%
Debt instrument maturity date	2017
Debt instrument, carrying value	$ 81	81
Total long-term debt	$ 81	81
7.45% Due 2032 [Member] \| Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.45%
Debt instrument maturity date	2032
Debt instrument, carrying value	$ 185	185
Total long-term debt	185	185
Atlantic City Electric Co [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	1,039	904
Net unamortized discount	(1)	(1)
Unamortized debt issuance costs	(6)	(6)
Current portion of long-term debt	(2)	(15)
Total net long-term debt	1,030	882
Total long-term debt	1,039	904
Atlantic City Electric Co [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	1,039	904
Total long-term debt	1,039	904
Atlantic City Electric Co [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	171	215
Unamortized debt issuance costs	(1)	(1)
Current portion of long-term debt	(46)	(44)
Total Net Long-Term Debt	124	170
Total long-term debt	$ 171	215
Atlantic City Electric Co [Member] \| 7.68% Due 2015 - 2016 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.68%
Debt instrument maturity date, start	2015
Debt instrument maturity date, end	2016
Debt instrument, carrying value	$ 2	17
Total long-term debt	$ 2	17
Atlantic City Electric Co [Member] \| 7.75% Due 2018 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.75%
Debt instrument maturity date	2018
Debt instrument, carrying value	$ 250	250
Total long-term debt	$ 250	250
Atlantic City Electric Co [Member] \| 6.80% Due 2021 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.80%
Debt instrument maturity date	2021
Debt instrument, carrying value	$ 39	39
Total long-term debt	$ 39	39
Atlantic City Electric Co [Member] \| 4.35% Due 2021 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.35%
Debt instrument maturity date	2021
Debt instrument, carrying value	$ 200	200
Total long-term debt	$ 200	200
Atlantic City Electric Co [Member] \| 3.375% Due 2024 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.375%
Debt instrument maturity date	2024
Debt instrument, carrying value	$ 150	150
Total long-term debt	$ 150	150
Atlantic City Electric Co [Member] \| 3.50% Due 2025 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.50%
Debt instrument maturity date	2025
Debt instrument, carrying value	$ 150
Total long-term debt	$ 150
Atlantic City Electric Co [Member] \| 4.875% Due 2029 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.875%
Debt instrument maturity date	2029
Debt instrument, carrying value	$ 23	23
Total long-term debt	$ 23	23
Atlantic City Electric Co [Member] \| 5.80% Due 2034 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.80%
Debt instrument maturity date	2034
Debt instrument, carrying value	$ 120	120
Total long-term debt	$ 120	120
Atlantic City Electric Co [Member] \| 5.80% Due 2036 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.80%
Debt instrument maturity date	2036
Debt instrument, carrying value	$ 105	105
Total long-term debt	$ 105	105
Atlantic City Electric Co [Member] \| 4.91% Due 2017 [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.91%
Debt instrument maturity date	2017
Debt instrument, carrying value		17
Total long-term debt		17
Atlantic City Electric Co [Member] \| 5.05% Due 2020 [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.05%
Debt instrument maturity date	2020
Debt instrument, carrying value	$ 39	51
Total long-term debt	$ 39	51
Atlantic City Electric Co [Member] \| 5.55% Due 2023 [Member] \| Transition Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.55%
Debt instrument maturity date	2023
Debt instrument, carrying value	$ 132	147
Total long-term debt	$ 132	147
Atlantic City Electric Co [Member] \| 3.5% Due 2025 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.50%
Debt instrument maturity date	2025
Debt instrument, carrying value	$ 150
Total long-term debt	150
Delmarva Power & Light Co/De [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	1,168	1,068
Net unamortized discount	2	3
Unamortized debt issuance costs	(9)	(8)
Current portion of long-term debt	(100)	(100)
Total net long-term debt	1,061	963
Total long-term debt	1,168	1,068
Delmarva Power & Light Co/De [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	1,050	850
Total long-term debt	1,050	850
Delmarva Power & Light Co/De [Member] \| Unsecured Tax-Exempt Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	78	78
Total long-term debt	78	78
Delmarva Power & Light Co/De [Member] \| Medium-Term Notes [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	40	40
Total long-term debt	$ 40	40
Delmarva Power & Light Co/De [Member] \| Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value		100
Total long-term debt		100
Delmarva Power & Light Co/De [Member] \| 5.22% Due 2016 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.22%
Debt instrument maturity date	2016
Debt instrument, carrying value	$ 100	100
Total long-term debt	$ 100	100
Delmarva Power & Light Co/De [Member] \| 3.50% Due 2023 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.50%
Debt instrument maturity date	2023
Debt instrument, carrying value	$ 500	500
Total long-term debt	$ 500	500
Delmarva Power & Light Co/De [Member] \| 4.00% Due 2042 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.00%
Debt instrument maturity date	2042
Debt instrument, carrying value	$ 250	250
Total long-term debt	$ 250	250
Delmarva Power & Light Co/De [Member] \| 4.15% Due 2045 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.15%
Debt instrument maturity date	2045
Debt instrument, carrying value	$ 200
Total long-term debt	$ 200
Delmarva Power & Light Co/De [Member] \| 5.40% Due 2031 [Member] \| Unsecured Tax-Exempt Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.40%
Debt instrument maturity date	2031
Debt instrument, carrying value	$ 78	78
Total long-term debt	$ 78	78
Delmarva Power & Light Co/De [Member] \| 7.56% - 7.58% Due 2017 [Member] \| Medium-Term Notes [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2017
Debt instrument percentage, minimum	7.56%
Debt instrument percentage, maximum	7.58%
Debt instrument, carrying value	$ 14	14
Total long-term debt	$ 14	14
Delmarva Power & Light Co/De [Member] \| 6.81% Due 2018 [Member] \| Medium-Term Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.81%
Debt instrument maturity date	2018
Debt instrument, carrying value	$ 4	4
Total long-term debt	$ 4	4
Delmarva Power & Light Co/De [Member] \| 7.61% Due 2019 [Member] \| Medium-Term Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.61%
Debt instrument maturity date	2019
Debt instrument, carrying value	$ 12	12
Total long-term debt	$ 12	12
Delmarva Power & Light Co/De [Member] \| 7.72% Due 2027 [Member] \| Medium-Term Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.72%
Debt instrument maturity date	2027
Debt instrument, carrying value	$ 10	10
Total long-term debt	$ 10	10
Delmarva Power & Light Co/De [Member] \| 5.00% Due 2015 [Member] \| Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.00%
Debt instrument maturity date	2015
Debt instrument, carrying value	$ 0	100
Total long-term debt	0	100
Potomac Electric Power Co [Member]
Debt Instrument [Line Items]
Debt instrument, carrying value	2,335	2,135
Net unamortized discount	(3)	(11)
Unamortized debt issuance costs	(31)	(28)
Total net long-term debt	2,301	2,096
Total long-term debt	$ 2,335	2,135
Potomac Electric Power Co [Member] \| 3.05% Due 2022 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.05%
Debt instrument maturity date	2022
Debt instrument, carrying value	$ 200	200
Total long-term debt	$ 200	200
Potomac Electric Power Co [Member] \| 6.20% Due 2022 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.20%
Debt instrument maturity date	2022
Debt instrument, carrying value	$ 110	110
Total long-term debt	$ 110	110
Potomac Electric Power Co [Member] \| 3.60% Due 2024 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	3.60%
Debt instrument maturity date	2024
Debt instrument, carrying value	$ 400	400
Total long-term debt	$ 400	400
Potomac Electric Power Co [Member] \| 5.75% Due 2034 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.75%
Debt instrument maturity date	2034
Debt instrument, carrying value	$ 100	100
Total long-term debt	$ 100	100
Potomac Electric Power Co [Member] \| 5.40% Due 2035 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	5.40%
Debt instrument maturity date	2035
Debt instrument, carrying value	$ 175	175
Total long-term debt	$ 175	175
Potomac Electric Power Co [Member] \| 6.50% Due 2037 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	6.50%
Debt instrument maturity date	2037
Debt instrument, carrying value	$ 500	500
Total long-term debt	$ 500	500
Potomac Electric Power Co [Member] \| 7.90% Due 2038 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	7.90%
Debt instrument maturity date	2038
Debt instrument, carrying value	$ 250	250
Total long-term debt	$ 250	250
Potomac Electric Power Co [Member] \| 4.15% Due 2043 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.15%
Debt instrument maturity date	2043
Debt instrument, carrying value	$ 450	250
Total long-term debt	$ 450	250
Potomac Electric Power Co [Member] \| 4.95% Due 2043 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt interest percentage	4.95%
Debt instrument maturity date	2043
Debt instrument, carrying value	$ 150	150
Total long-term debt	$ 150	150
Pepco Energy Services [Member] \| 6.70% - 7.46% Due 2017-2018 [Member] \| Secured Notes [Member]
Debt Instrument [Line Items]
Debt instrument maturity date, start	2015
Debt instrument maturity date, end	2018
Debt instrument percentage, minimum	6.70%
Debt instrument percentage, maximum	7.46%
Debt instrument, carrying value	$ 3	4
Total long-term debt	$ 3	$ 4

Debt instrument maturity year.

No definition available.

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Namespace Prefix:	pom_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, maturity year range, end.

+ References

No definition available.

+ Details

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Namespace Prefix:	pom_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, maturity year range, start.

+ References

No definition available.

+ Details

Name:	pom_DebtInstrumentMaturityYearRangeStart
Namespace Prefix:	pom_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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