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DEBT (Narrative) (Details) |  |  |  |  | 1 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 11, 2021 USD ($) | Jun. 24, 2021 USD ($) | Mar. 11, 2021 USD ($) | Jul. 01, 2020 USD ($) numberOfClaimHolder numberOfExtensionOption | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Oct. 29, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 22, 2021 USD ($) | Jun. 04, 2021 party | May 14, 2021 party | May 11, 2021 USD ($) | Apr. 23, 2021 USD ($) | Feb. 24, 2021 USD ($) | Apr. 30, 2020 USD ($)
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 7,000,000,000 |  |  |  |  |  |  |  |  |  |
Intercompany note | $ 145,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Northern California wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer Harm Threshold, post-emergence transaction, securitized |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000,000 | $ 7,500,000,000 |  | $ 7,500,000,000
Customer Harm Threshold, post-emergence transaction, debt retirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000,000
Number of parties whom filed for rehearing with company response (party) | party |  |  |  |  |  |  |  |  |  |  | 2 | 3 |  |  |  |
2017 Northern California wildfires | Fire Risk Mitigation Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer Harm Threshold, post-emergence transaction, securitized |  | $ 1,190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,190,000,000 |
Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intercompany note |  |  |  |  |  | 145,000,000 | $ 0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | PG&E Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 500,000,000 |  | 500,000,000 |  |  |  |  |  |  |  |  |  |
Debt, number of extension options | numberOfExtensionOption |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, extension option, term |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 3,500,000,000 |  | $ 4,000,000,000 |  |  |  | $ 4,000,000,000 |  |  |  |  |  |
Debt, number of extension options | numberOfClaimHolder |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, extension option, term |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Credit Facility | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
364-Day Term Loan Facility | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in days) |  |  |  | 364 days | 364 days |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
18-Month Term Loan Facility | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in days) |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, October 2022 | Pacific Gas & Electric Co (Utility) | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |
Term Loan, January 2022 | Pacific Gas & Electric Co (Utility) | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 184,000,000 |  |  |  |  |  |  |  |
First Mortgage Bonds, Exchange Stated Maturity 2023 | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.367% |  |  |  |  |  |  |  |  |  |  |
First Mortgage Bonds, Exchange Stated Maturity 2031 | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
First Mortgage Bonds, Exchange Stated Maturity 2041 | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.20% |  |  |  |  |  |  |  |  |  |  |
First Mortgage Bonds, Exchange Stated Maturity 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Intercompany Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in days) | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery Bonds | 2017 Northern California wildfires | Fire Risk Mitigation Capital Expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 13,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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