SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - 10Q Narrative (Details) ft² in Thousands			3 Months Ended
	Nov. 17, 2022 USD ($)	Oct. 18, 2022 USD ($)	Mar. 31, 2023 USD ($) ft²	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Public Utility, Property, Plant and Equipment [Line Items]
Period for probable revenue recovery			24 months
Credit losses			$ 139,000,000
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]			Operating and maintenance
Litigation liability, current			$ 193,000,000
Wildfire Fund asset			460,000,000		$ 460,000,000
Litigation contribution, net			4,700,000,000
Amortization and accretion			117,000,000	$ 118,000,000
Insurance receivable			743,000,000		794,000,000
Performance-Based Disbursement
Public Utility, Property, Plant and Equipment [Line Items]
Disbursement		$ 7
Maximum disbursement		300,000,000
Performance-Based Disbursement | Utilities Operating Expense, Maintenance and Operations
Public Utility, Property, Plant and Equipment [Line Items]
Reimbursement amount			33,000,000
Civil Nuclear Credit Program
Public Utility, Property, Plant and Equipment [Line Items]
Disbursement	$ 1,100,000,000
Regulatory Balancing Accounts Receivable
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			3,392,000,000		3,264,000,000
Regulatory Balancing Accounts Receivable | Residential uncollectibles balancing accounts
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			104,000,000		126,000,000
COVID-19 Pandemic protection memorandum account
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			4,000,000
FERC
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			25,000,000
2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			$ 529,000,000		530,000,000
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			$ 937,000,000
Other noncurrent assets – other | 2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			175,000,000
Long-Term Debt | Performance-Based Disbursement
Public Utility, Property, Plant and Equipment [Line Items]
Reimbursement amount			279,000,000
Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Wildfire Fund asset			460,000,000		460,000,000
Amortization and accretion			$ 117,000,000	$ 118,000,000
Pacific Gas & Electric Co (Utility) | The Lakeside Building
Public Utility, Property, Plant and Equipment [Line Items]
Rentable square feet | ft²			910
Receivables Securitization Program | Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Outstanding borrowings			$ 1,230,000,000		1,200,000,000
Receivables Securitization Program | PG&E AR Facility, LLC (SPV)
Public Utility, Property, Plant and Equipment [Line Items]
Accounts receivable, net			3,200,000,000		3,600,000,000
Recovery Bonds | Secured Debt
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount			1,800,000,000		1,800,000,000
SB 901 Securitization | Secured Debt
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount			$ 7,500,000,000		$ 7,500,000,000
Senate Bill 846 | Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount		1,100,000,000
Senate Bill 846 | Pacific Gas & Electric Co (Utility) | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount		$ 1,400,000,000