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Combined maximum amount of credit facility available to parent in the event of the adjustment of the credit sub-limits at the borrowers election.

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Commercial paper program maximum.

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No definition available.

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Contractual Obligation Payments Period

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No definition available.

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Maximum Number Of Sublimit Reallocation Per Year

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- Definition

Ownership Percentage Basis Point For Change In Control

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No definition available.

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- Definition

Parent Company Borrowing Capacity Under Credit Facilities

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The maximum amount of the credit facility that the parent company may obtain for letters of credit.

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No definition available.

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- Definition

Purchase Price Under Agreement To Sell

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Maximum ratio of deferrable interest subordinated debt to capitalization permitted to be excluded from the computation of total indebtedness under the credit facility and term loan agreements.

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No definition available.

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Maximum ratio of indebtedness to capitalization permitted under the credit facility and term loan agreements.

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No definition available.

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- Definition

Maximum percentage of credit facility that each company may borrow under the swing-line loan sub-facility.

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No definition available.

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Subsidiary borrowing limit under parents credit facility in the event of the adjustment of the credit sub-limits at the borrowers election.

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No definition available.

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- Definition

Swing Line Loan Repayment Period

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No definition available.

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Weighted average maturity.

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No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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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.

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

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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.

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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Amount of the required periodic payments applied to principal.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Weighted average interest rate of short-term debt outstanding.

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Debt - Additional Information (Detail)					1 Months Ended			9 Months Ended	12 Months Ended
Debt - Additional Information (Detail)	Oct. 01, 2015 USD ($)	Sep. 28, 2015 USD ($)	Jul. 30, 2015 USD ($)	Oct. 24, 2013 USD ($)	Oct. 31, 2015 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) Sublimit	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Amended description of Change in Control								The Consent amends the definition of "Change in Control" in the credit agreement to mean, following consummation of the Merger, an event or series of events by which Exelon no longer owns, directly or indirectly, 100% of the outstanding shares of voting stock of Pepco Holdings.
Ownership percentage of outstanding voting stock for Change in Control								100.00%
On-going commercial paper								$ 875,000,000
Short-term debt								1,128,000,000	$ 729,000,000
Purchase price		$ 5,000,000							$ 12,000,000
Contract payment period		15 years							9 years
Pepco Energy Services [Member]
Debt Instrument [Line Items]
Purchase price				$ 7,000,000
Contract payment period				23 years
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term debt								$ 384,000,000
Commercial paper weighted average interest rate								0.76%
Weighted average maturity, in days								10 days
Unsecured Syndicated Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, termination date								Aug. 01, 2018
Line of credit facility maximum borrowing capacity								$ 1,500,000,000
Parent company credit facility letter of credit, maximum								$ 500,000,000
Same day borrowings maximum percentage amount								10.00%
Swingline loan repayment period								14 days
Credit facility borrowing capacity								$ 750,000,000
Maximum amount of credit available to parent								1,250,000,000
Subsidiary borrowing limit under parent's credit facility								$ 500,000,000
Maximum number of sublimit reallocations per year \| Sublimit								8
Borrowing capacity under the credit facility								$ 1,029,000,000	$ 875,000,000
Utility subsidiaries combined cash and borrowing capacity								$ 413,000,000	413,000,000
Unsecured Syndicated Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								0.50%
Unsecured Syndicated Credit Facility [Member] \| One Month London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								1.00%
Unsecured Syndicated Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to total capitalization								65.00%
Ratio of deferrable interest subordinated debt to total capitalization								15.00%
2.70% Notes Due October 1,2015 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	Oct. 01, 2015
Repayments of notes	$ 250,000,000
Debt interest percentage	2.70%
Potomac Electric Power Co [Member]
Debt Instrument [Line Items]
Amended description of Change in Control								The Consent amends the definition of "Change in Control" in the credit agreement to mean, following consummation of the Merger, an event or series of events by which Exelon no longer owns, directly or indirectly, 100% of the outstanding shares of voting stock of Pepco Holdings.
Ownership percentage of outstanding voting stock for Change in Control								100.00%
On-going commercial paper								$ 500,000,000
Short-term debt								48,000,000	104,000,000
Purchase price		$ 5,000,000							$ 12,000,000
Contract payment period		15 years							9 years
Potomac Electric Power Co [Member] \| Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term debt								$ 48,000,000
Commercial paper weighted average interest rate								0.43%
Weighted average maturity, in days								5 days
Potomac Electric Power Co [Member] \| Unsecured Syndicated Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, termination date								Aug. 01, 2018
Line of credit facility maximum borrowing capacity								$ 1,500,000,000
Parent company credit facility letter of credit, maximum								$ 500,000,000
Same day borrowings maximum percentage amount								10.00%
Swingline loan repayment period								14 days
Credit facility borrowing capacity								$ 200,000,000
Maximum amount of credit available to parent								1,250,000,000
Subsidiary borrowing limit under parent's credit facility								$ 500,000,000
Maximum number of sublimit reallocations per year \| Sublimit								8
Utility subsidiaries combined cash and borrowing capacity								$ 413,000,000	$ 413,000,000
Potomac Electric Power Co [Member] \| Unsecured Syndicated Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								0.50%
Potomac Electric Power Co [Member] \| Unsecured Syndicated Credit Facility [Member] \| One Month London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								1.00%
Potomac Electric Power Co [Member] \| Unsecured Syndicated Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to total capitalization								65.00%
Ratio of deferrable interest subordinated debt to total capitalization								15.00%
Delmarva Power & Light Co/De [Member]
Debt Instrument [Line Items]
Amended description of Change in Control								The Consent amends the definition of "Change in Control" in the credit agreement to mean, following consummation of the Merger, an event or series of events by which Exelon no longer owns, directly or indirectly, 100% of the outstanding shares of voting stock of Pepco Holdings.
Ownership percentage of outstanding voting stock for Change in Control								100.00%
On-going commercial paper								$ 500,000,000
Short-term debt								171,000,000	211,000,000
Delmarva Power & Light Co/De [Member] \| Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term debt								$ 66,000,000
Commercial paper weighted average interest rate								0.46%
Weighted average maturity, in days								3 days
Delmarva Power & Light Co/De [Member] \| Unsecured Syndicated Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, termination date								Aug. 01, 2018
Line of credit facility maximum borrowing capacity								$ 1,500,000,000
Parent company credit facility letter of credit, maximum								$ 500,000,000
Same day borrowings maximum percentage amount								10.00%
Swingline loan repayment period								14 days
Credit facility borrowing capacity								$ 250,000,000
Maximum amount of credit available to parent								1,250,000,000
Subsidiary borrowing limit under parent's credit facility								$ 500,000,000
Maximum number of sublimit reallocations per year \| Sublimit								8
Utility subsidiaries combined cash and borrowing capacity								$ 413,000,000	413,000,000
Delmarva Power & Light Co/De [Member] \| Unsecured Syndicated Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								0.50%
Delmarva Power & Light Co/De [Member] \| Unsecured Syndicated Credit Facility [Member] \| One Month London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								1.00%
Delmarva Power & Light Co/De [Member] \| Unsecured Syndicated Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to total capitalization								65.00%
Ratio of deferrable interest subordinated debt to total capitalization								15.00%
Atlantic City Electric Co [Member]
Debt Instrument [Line Items]
Amended description of Change in Control								The Consent amends the definition of "Change in Control" in the credit agreement to mean, following consummation of the Merger, an event or series of events by which Exelon no longer owns, directly or indirectly, 100% of the outstanding shares of voting stock of Pepco Holdings.
Ownership percentage of outstanding voting stock for Change in Control								100.00%
On-going commercial paper								$ 350,000,000
Short-term debt								225,000,000	127,000,000
Atlantic City Electric Co [Member] \| Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term debt								$ 225,000,000
Commercial paper weighted average interest rate								0.46%
Weighted average maturity, in days								6 days
Atlantic City Electric Co [Member] \| Unsecured Syndicated Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, termination date								Aug. 01, 2018
Line of credit facility maximum borrowing capacity								$ 1,500,000,000
Parent company credit facility letter of credit, maximum								$ 500,000,000
Same day borrowings maximum percentage amount								10.00%
Swingline loan repayment period								14 days
Credit facility borrowing capacity								$ 300,000,000
Maximum amount of credit available to parent								1,250,000,000
Subsidiary borrowing limit under parent's credit facility								$ 500,000,000
Maximum number of sublimit reallocations per year \| Sublimit								8
Utility subsidiaries combined cash and borrowing capacity								$ 413,000,000	$ 413,000,000
Atlantic City Electric Co [Member] \| Unsecured Syndicated Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								0.50%
Atlantic City Electric Co [Member] \| Unsecured Syndicated Credit Facility [Member] \| One Month London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate								1.00%
Atlantic City Electric Co [Member] \| Unsecured Syndicated Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to total capitalization								65.00%
Ratio of deferrable interest subordinated debt to total capitalization								15.00%
Atlantic City Electric Co [Member] \| Series 2002-1 Bonds, Class A-3 [Member]
Debt Instrument [Line Items]
Debt instrument periodical principal payments							$ 1,000,000
Atlantic City Electric Co [Member] \| Series 2002-1 Bonds, Class A-4 [Member]
Debt Instrument [Line Items]
Debt instrument periodical principal payments							6,000,000
Atlantic City Electric Co [Member] \| Series 2002-1 Bonds, Class A-4 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument periodical principal payments					$ 9,000,000
Atlantic City Electric Co [Member] \| Series 2003-1 Bonds, Class A-3 [Member]
Debt Instrument [Line Items]
Debt instrument periodical principal payments							$ 3,000,000
Atlantic City Electric Co [Member] \| Series 2003-1 Bonds, Class A-3 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument periodical principal payments					$ 3,000,000
Atlantic City Electric Co [Member] \| Medium Term Notes Series C [Member]
Debt Instrument [Line Items]
Repayment of secured medium-term notes						$ 15,000,000
PHI [Member] \| Term Loan Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, percentage added to reference rate			0.95%
Debt instrument, carrying value			$ 300,000,000
Debt instrument maturity date								Jul. 28, 2016