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Commitments And Contingencies (Environmental Remediation Liability Composed) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Topock natural gas compressor station $ 298pcg_UtilityOwnedNaturalGasCompressorSiteNearTopockArizona [1] $ 291pcg_UtilityOwnedNaturalGasCompressorSiteNearTopockArizona [1]
Hinkley natural gas compressor station 153pcg_UtilityOwnedNaturalGasCompressorSiteNearHinkleyCalifornia [1] 158pcg_UtilityOwnedNaturalGasCompressorSiteNearHinkleyCalifornia [1]
Former manufactured gas plant sites owned by the Utility or third parties 257pcg_FormerMgpSitesOwnedByUtilityOrThirdParties 257pcg_FormerMgpSitesOwnedByUtilityOrThirdParties
Utility-owned generation facilities (other than for fossil fuel-fired), other facilities, and third-party disposal sites 159pcg_UtilityOwnedGenerationFacilitiesOtherThanForFossilFuelFiredOtherFacilitiesAndThirdPartyDisposalSites 150pcg_UtilityOwnedGenerationFacilitiesOtherThanForFossilFuelFiredOtherFacilitiesAndThirdPartyDisposalSites
Fossil fuel-fired generation facilities and sites 98pcg_FossilFuelFiredGenerationFacilitiesFormerlyOwnedByUtility 98pcg_FossilFuelFiredGenerationFacilitiesFormerlyOwnedByUtility
Total environmental remediation liability $ 965pcg_EnvironmentalRemediationLiability $ 954pcg_EnvironmentalRemediationLiability
[1] See "Natural Gas Compressor Station Sites" below.