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CONTINGENCIES AND COMMITMENTS (Other Matters) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Accrued legal liabilities	$ 89	$ 86

X

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to claims and litigation, regulatory proceedings, penalties and other legal matters.

+ References

No definition available.

+ Details

Name:	pcg_AccruedLegalLiabilities
Namespace Prefix:	pcg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=pcg_PacificGasElectricCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: