Leasing Activities (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Leasing Activities
Lease investments	$ 1,300,000,000	$ 1,300,000,000	$ 1,400,000,000
Aggregate cash proceeds		161,000,000
Pre-tax gain		39,000,000
Lessees termination payments		423,000,000
Reversal of permanent tax benefits	22,000,000	22,000,000
After-tax gain		3,000,000
Income tax provision at statutory federal rate		$ 14,000,000

Gain Loss On Contract Termination After Tax

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Namespace Prefix:	pom
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Income Tax Provision At Statutory Federal Rate

+ Details

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Namespace Prefix:	pom
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Lease Terminations Payments, To Retire Non Recourse Debt Associated With Leases

+ Details

Name:	pom_LeaseTerminationsPaymentsToRetireNonRecourseDebtAssociatedWithLeases
Namespace Prefix:	pom
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reversal Of Tax Benefits Previously Recorded Permanent Tax Benefits

+ Details

Name:	pom_ReversalOfTaxBenefitsPreviouslyRecordedPermanentTaxBenefits
Namespace Prefix:	pom
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The lessor's asset under sales type and direct financing leases. The net investment in direct financing and sales-type leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) estimated executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 23
-Subparagraph a(i)

+ Details

Name:	us-gaap_CapitalLeasesNetInvestmentInDirectFinancingAndSalesTypeLeases
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the income received from or payment made to a third party in connection with the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one or the other party, a failure to perform.

+ Details

Name:	us-gaap_GainLossOnContractTermination
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the sale of a lease held for investment, which may be a lease of real estate, equipment or other fixed assets for a specified time in exchange for payment, usually in the form of rent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph a

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration