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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - 10Q Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Sep. 30, 2022 USD ($) employee | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) employee | Sep. 30, 2021 USD ($) | Jul. 20, 2022 USD ($) | May 10, 2022 USD ($) | Nov. 12, 2021 USD ($) | Dec. 31, 2020 USD ($)
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 |  | $ 193 |  |  |  |  |
Wildfire Fund asset | $ 461 | 461 |  | 461 |  |  |  |  |
Litigation contribution, net |  | 5,000 |  | 5,000 |  |  |  |  |
Amortization and accretion |  | 118 | $ 162 | 353 | $ 399 |  |  |  |
Insurance receivable | 1,247 | $ 1,120 |  | $ 1,120 |  |  |  |  |
Number of eligible employees | employee |  | 470 |  | 470 |  |  |  |  |
Credit losses |  |  |  | $ 126 |  |  |  |  |
Asset retirement obligation | 5,300 |  |  |  |  |  |  |  | $ 6,400
Decrease in decommissioning cost | 1,300 |  |  |  |  |  |  |  |
Decommissioning cost estimate | 4,000 |  |  |  |  |  |  |  |
Decrease in decommissioning cost, un-escalated | 378 |  |  |  |  |  |  |  |
Decrease in decommissioning cost, escalated | 2,600 |  |  |  |  |  |  |  |
Increase in asset retirement obligation |  |  |  | 925 |  |  |  |  |
One-time Termination Benefits |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Severance costs |  | $ 77 |  |  |  |  |  |  |
Credits to employee retirement health savings accounts |  | 22 |  |  |  |  |  |  |
Regulatory Balancing Accounts Receivable |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total regulatory balancing accounts | 2,999 | 3,037 |  | 3,037 |  |  |  |  |
Regulatory Balancing Accounts Receivable | Residential uncollectibles balancing accounts |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total regulatory balancing accounts | 127 | 109 |  | 109 |  |  |  |  |
COVID-19 Pandemic protection memorandum account |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  | 10 |  | 10 |  |  |  |  |
FERC |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  | 10 |  | 10 |  |  |  |  |
2021 Dixie fire |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Insurance receivable | 563 | 553 |  | $ 553 |  |  |  |  |
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 |  | $ 1,100 |  |  |  |  |
Other noncurrent assets – other | 2021 Dixie fire |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Insurance receivable |  | 150 |  | 150 |  |  |  |  |
Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Wildfire Fund asset | 461 | 461 |  | 461 |  |  |  |  |
Amortization and accretion |  | 118 | $ 162 | 353 | $ 399 |  |  |  |
Receivables Securitization Program | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings | 974 | 1,325 |  | 1,325 |  |  |  |  |
Receivables Securitization Program | PG&E AR Facility, LLC (SPV) |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable, net | 3,300 | 3,300 |  | 3,300 |  |  |  |  |
Recovery Bonds | Secured Debt |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 860 | 842 |  | 842 |  |  |  | $ 860 |
Recovery Bonds | Secured Debt | Tranche One |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 266 |
Interest rate |  |  |  |  |  |  |  | 1.46% |
Recovery Bonds | Secured Debt | Tranche Two |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 160 |
Interest rate |  |  |  |  |  |  |  | 2.28% |
Recovery Bonds | Secured Debt | Tranche Three |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 434 |
Interest rate |  |  |  |  |  |  |  | 2.82% |
SB 901 Securitization | Secured Debt |  |  |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 7,500 |  | $ 7,500 |  | $ 3,900 | $ 3,600 |  |

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