SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - 10Q Narrative (Details) ft² in Thousands			3 Months Ended
	Jan. 11, 2024 USD ($)	Oct. 18, 2022 USD ($)	Mar. 31, 2024 USD ($) ft²	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2022 USD ($)	Jul. 20, 2022 USD ($)	May 10, 2022 USD ($)	Nov. 12, 2021 USD ($)	Jul. 12, 2019
Public Utility, Property, Plant and Equipment [Line Items]
Period for probable revenue recovery			24 months
Credit losses			$ 70,000,000	$ 139,000,000
Regulatory assets			$ 16,333,000,000		$ 17,189,000,000
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]			Operating and maintenance
Litigation liability, current			$ 193,000,000
Wildfire Fund asset			305,000,000		450,000,000
Litigation contribution, net			4,400,000,000
Amortization and accretion			78,000,000	117,000,000
Insurance receivable			361,000,000		436,000,000
Performance-Based Disbursement
Public Utility, Property, Plant and Equipment [Line Items]
Disbursement		$ 7
Maximum disbursement		300,000,000
Civil Nuclear Credit Program
Public Utility, Property, Plant and Equipment [Line Items]
Disbursement	$ 1,100,000,000
Civil Nuclear Credit Program | Cost of Goods and Services Sold, Electricity
Public Utility, Property, Plant and Equipment [Line Items]
Reimbursement amount			140,000,000
Regulatory Balancing Accounts Receivable
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			6,442,000,000		5,660,000,000
Regulatory Balancing Accounts Receivable | Residential uncollectibles balancing accounts
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			55,000,000		507,000,000
Decrease in regulatory balancing accounts			500,000,000
COVID-19 pandemic protection memorandum account, undercollection bad debt
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			6,000,000		5,000,000
FERC
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			79,000,000		78,000,000
2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			$ 251,000,000		326,000,000
Wildfire Fund Asset
Public Utility, Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life			20 years							15 years
Other Current Liabilities
Public Utility, Property, Plant and Equipment [Line Items]
Wildfire fund, noncurrent			$ 752,000,000
Other noncurrent assets – other | 2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			450,000,000
Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			16,333,000,000		17,189,000,000
Wildfire Fund asset			305,000,000		450,000,000
Amortization and accretion			$ 78,000,000	$ 117,000,000
Pacific Gas & Electric Co (Utility) | The Lakeside Building
Public Utility, Property, Plant and Equipment [Line Items]
Rentable square feet | ft²			910
Pacific Gas & Electric Co (Utility) | Other noncurrent assets – other | 2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			$ 150,000,000
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
Receivables Securitization Program | Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Outstanding borrowings			1,500,000,000		1,500,000,000
Receivables Securitization Program | PG&E AR Facility, LLC (SPV)
Public Utility, Property, Plant and Equipment [Line Items]
Accounts receivable, net			3,000,000,000		2,700,000,000
Recovery Bonds | Secured Debt
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount			1,800,000,000		1,800,000,000				$ 860,000,000
Series 2022-A Recovery Bonds
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount						$ 983,000,000
SB 901 Securitization | Secured Debt
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount			$ 7,300,000,000		$ 7,300,000,000		$ 3,900,000,000	$ 3,600,000,000