FAIR VALUE MEASUREMENTS (Equity Backstop Commitments and Forward Stock Purchase Agreements) (Details) $ in Millions	Jun. 30, 2020 USD ($)
Fair Value Disclosures [Abstract]
Backstop commitment premium, expense	$ 1,100
Additional backstop commitment premium, expense	$ 444

Plan of Reorganization, Additional Backstop Commitment Premium, Expense

No definition available.

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