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Property, Plant and Equipment (Details) (PEC, USD $) In Millions	Jun. 30, 2011
PEC
Utility Plant
Net carrying value of facilities intended to retire	$ 171

X

- Definition

Period end amount of plant held for retirement less the period end accumulated depreciation on plant held for retirement that is owned by the regulated operations of the public utility.

+ Details

Name:	pgn_PublicUtilitiesPlantRetirementCarryingValue
Namespace Prefix:	pgn
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	pgn_UtilityPlantAbstract
Namespace Prefix:	pgn
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration