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%