SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - 10Q Narrative (Details) ft² in Thousands			3 Months Ended		9 Months Ended
	Jan. 11, 2024 USD ($)	Oct. 18, 2022 USD ($)	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($)	Aug. 01, 2024 USD ($)	Mar. 31, 2024	Dec. 31, 2023 USD ($)	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			$ 109,000,000	$ 259,000,000	$ 244,000,000	$ 552,000,000
Regulatory assets			$ 15,584,000,000		$ 15,584,000,000				$ 17,189,000,000
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]			Operating and maintenance	Operating and maintenance	Operating and maintenance	Operating and maintenance
Litigation liability, current			$ 193,000,000		$ 193,000,000
Wildfire Fund asset			301,000,000		301,000,000				450,000,000
Litigation contribution, net			4,200,000,000		4,200,000,000
Amortization and accretion			139,000,000	$ 219,000,000	295,000,000	$ 453,000,000
Performance-Based Disbursement
Public Utility, Property, Plant and Equipment [Line Items]
Disbursement		$ 7
Maximum disbursement		300,000,000
Performance-Based Disbursement | Cost of Goods and Services Sold, Electricity
Public Utility, Property, Plant and Equipment [Line Items]
Reimbursement amount				48,000,000		48,000,000
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			71,000,000	72,000,000	370,000,000	106,000,000
Regulatory Balancing Accounts Receivable
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			7,150,000,000		7,150,000,000				5,660,000,000
Regulatory Balancing Accounts Receivable | Residential uncollectibles balancing accounts
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			174,000,000		174,000,000				507,000,000
Decrease in regulatory balancing accounts					500,000,000
FERC
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			78,000,000		78,000,000				78,000,000
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			755,000,000		755,000,000
Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			15,584,000,000		15,584,000,000				17,189,000,000
Wildfire Fund asset			301,000,000		301,000,000				450,000,000
Amortization and accretion			$ 139,000,000	$ 219,000,000	$ 295,000,000	$ 453,000,000
Pacific Gas & Electric Co (Utility) | The Lakeside Building
Public Utility, Property, Plant and Equipment [Line Items]
Rentable square feet | ft²			910		910
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				1,500,000,000
Receivables Securitization Program | PG&E AR Facility, LLC (SPV)
Public Utility, Property, Plant and Equipment [Line Items]
Accounts receivable, net			3,400,000,000		3,400,000,000				2,700,000,000
Recovery Bonds | Secured Debt
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount			3,200,000,000		3,200,000,000				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
Series 2024-A Recovery Bonds
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount							$ 1,420,000,000
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				$ 7,300,000,000		$ 3,900,000,000	$ 3,600,000,000