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OTHER CONTINGENCIES AND COMMITMENTS (Other Matters) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Accrued legal liabilities | $ 88 | $ 134

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

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