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CONTINGENCIES AND COMMITMENTS (Schedule of Insurance Receivable) (Details) - Butte Fire - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Insurance Receivable [Roll Forward] |  |  |
Insurance Receivable, Beginning Balance | $ 596 | $ 575 | $ 0
Accrued insurance recoveries | 0 | 297 | 625
Reimbursements | (197) | (276) | (50)
Insurance Receivable, Ending Balance | $ 399 | $ 596 | $ 575

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- Definition Probable insurance recoveries recorded by the Utility in connection with losses related to the Butte fire. + References No definition available. + Details
Name: | pcg_AccruedInsuranceRecoveries
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Insurance Receivable [Roll Forward] + References No definition available. + Details
Name: | pcg_InsuranceReceivableRollForward
Namespace Prefix: | pcg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInInsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | pcg_LocationOfCourtsAxis=pcg_ButteFireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |