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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - 10Q Narrative (Details) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 20, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Nov. 12, 2021
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Period for probable revenue recovery |  | 24 months |  |  |
Monte carlo simulation, historical data, period |  | 12 years |  |  |
Litigation liability, current |  | $ 193,000,000 |  |  |
Wildfire Fund asset |  | 461,000,000 |  | $ 461,000,000 |
Litigation contribution, net |  | 5,200,000,000 |  |  |
Amortization and accretion |  | 118,000,000 | $ 119,000,000 |  |
Insurance receivable |  | 1,204,000,000 |  | 1,247,000,000 |
Expected credit losses |  | 43,000,000 |  |  |
Regulatory Balancing Accounts Receivable |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Total regulatory balancing accounts |  | 3,165,000,000 |  | 2,999,000,000 |
Regulatory Balancing Accounts Receivable | Residential uncollectibles balancing accounts |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Total regulatory balancing accounts |  | 104,000,000 |  | 127,000,000 |
COVID-19 Pandemic protection memorandum account |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Regulatory assets |  | 28,000,000 |  |  |
2021 Dixie fire |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Insurance receivable |  | $ 562,000,000 |  | 563,000,000 |
Wildfire Fund Asset |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  | 15 years |  |  |
Other Current Liabilities |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Wildfire fund, noncurrent |  | $ 1,100,000,000 |  |  |
Other noncurrent assets – other | 2021 Dixie fire |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Insurance receivable |  | 150,000,000 |  |  |
Pacific Gas & Electric Co (Utility) |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Wildfire Fund asset |  | 461,000,000 |  | 461,000,000 |
Amortization and accretion |  | 118,000,000 | $ 119,000,000 |  |
Receivables Securitization Program | Pacific Gas & Electric Co (Utility) |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Aggregate maximum amount of loans made by lenders |  | 1,000,000,000 |  |  |
Outstanding borrowings |  | 1,000,000,000 |  | 974,000,000 |
Receivables Securitization Program | Pacific Gas & Electric Co (Utility) | Subsequent Event |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Aggregate maximum amount of loans made by lenders | $ 1,500,000,000 |  |  |  |
Increase in facility amount | $ 500,000,000 |  |  |  |
Receivables Securitization Program | PG&E AR Facility, LLC (SPV) |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Accounts receivable, net |  | 2,900,000,000 |  | 3,300,000,000 |
Recovery Bonds | Senior Secured Superpriority Debt |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 860,000,000 |  | $ 860,000,000 | $ 860,000,000
Recovery Bonds | Senior Secured Superpriority Debt | Tranche One |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 266,000,000
Interest rate |  |  |  |  | 1.46%
Recovery Bonds | Senior Secured Superpriority Debt | Tranche Two |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 160,000,000
Interest rate |  |  |  |  | 2.28%
Recovery Bonds | Senior Secured Superpriority Debt | Tranche Three |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 434,000,000
Interest rate |  |  |  |  | 2.82%

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