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DERIVATIVES (Gains And Losses On Derivative Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Unrealized gain (loss) - regulatory assets and liabilities | $ (12) | $ (48)
Realized loss - cost of electricity | (18) | (5)
Realized loss - cost of natural gas | (1) | (1)
Net commodity risk | $ (31) | $ (54)

X
- Definition This item represents the gain realized during the period from derivatives related to electric third-party power purchase agreements. + References No definition available. + Details
Name: | pcg_RealizedGainLossOnCostOfElectricity
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the gain realized during the period from derivatives related to natural gas. + References No definition available. + Details
Name: | pcg_RealizedGainLossOnCostOfNaturalGas
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total Commodity Risk Instruments + References No definition available. + Details
Name: | pcg_TotalCommodityRiskInstruments
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration