SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)			1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 15, 2021 USD ($)	Feb. 16, 2021 USD ($) transmissionTower	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) facility numberOfFatality	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 12, 2021 USD ($)	Dec. 30, 2020 USD ($)	Jul. 12, 2019 USD ($)
Public Utility, Property, Plant and Equipment [Line Items]
Period for probable revenue recovery					24 months
Expected credit losses			$ 154,000,000	$ 154,000,000	$ 154,000,000
Allowance for credit loss decrease				207,000,000
Regulatory balancing accounts			2,999,000,000	2,999,000,000	2,999,000,000	$ 2,001,000,000
Decrease in nuclear decommissioning obligation			1,400,000,000
Expected capitalization, proceeds of bond			10,500,000,000	10,500,000,000	10,500,000,000
Expected capitalization, initial contribution			7,500,000,000	7,500,000,000	7,500,000,000
Expected capitalization, annual contribution			300,000,000	300,000,000	300,000,000
Expected wildfire fund allocation metric, percentage										64.20%
Expected wildfire fund allocation metric, initial contribution										$ 4,800,000,000
Expected wildfire fund allocation metric, annual contributions										$ 193,000,000
Expected wildfire fund allocation metric, annual contributions, second									$ 193,000,000
Litigation liability, current			193,000,000	193,000,000	193,000,000
Wildfire fund asset			461,000,000	461,000,000	461,000,000	464,000,000
Litigation contribution, net			$ 5,300,000,000	$ 5,300,000,000	5,300,000,000
Amortization and accretion					$ 517,000,000	413,000,000	$ 0
Monte carlo simulation, historical data, period					12 years
Amortization period					6 years
Percentage assumption change			10.00%	10.00%	10.00%
Insurance receivable			$ 1,247,000,000	$ 1,247,000,000	$ 1,247,000,000	674,000,000	2,238,000,000
Operating lease, payments					$ 2,400,000,000	$ 2,500,000,000
Weighted average remaining lease term			6 years 14 days	6 years 14 days	6 years 14 days	5 years 8 months 12 days
Weighted average discount rate			6.10%	6.10%	6.10%	6.20%
Proceeds from contract liability	$ 106,000,000
Litigation Settlement, Expense
Public Utility, Property, Plant and Equipment [Line Items]
Accelerated amortization					$ 43,000,000
2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			$ 563,000,000	$ 563,000,000	563,000,000	$ 0	$ 0
CPUC
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory balancing accounts			209,000,000	209,000,000	209,000,000
COVID-19 Pandemic protection memorandum account
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			30,000,000	30,000,000	30,000,000
Federal Energy Regulatory Commission
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			12,000,000	12,000,000	12,000,000
Regulatory Balancing Accounts Receivable
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			2,999,000,000	2,999,000,000	2,999,000,000	2,001,000,000
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable
Public Utility, Property, Plant and Equipment [Line Items]
Total regulatory balancing accounts			127,000,000	127,000,000	$ 127,000,000	0
Five Year Historical Period
Public Utility, Property, Plant and Equipment [Line Items]
Historical data period					5 years
Average annual statewide claims or settlements			6,500,000,000	6,500,000,000	$ 6,500,000,000
Twelve Year Historical Period
Public Utility, Property, Plant and Equipment [Line Items]
Historical data period					12 years
Average annual statewide claims or settlements			2,900,000,000	2,900,000,000	$ 2,900,000,000
Wildfire Fund Asset
Public Utility, Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life					15 years
Noncurrent liabilities – other
Public Utility, Property, Plant and Equipment [Line Items]
Wildfire fund, noncurrent			1,100,000,000	1,100,000,000	$ 1,100,000,000
Other noncurrent assets – other | 2021 Dixie fire
Public Utility, Property, Plant and Equipment [Line Items]
Insurance receivable			150,000,000	150,000,000	150,000,000
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	0		$ 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%
Recovery Bonds | Minimum | Senior Secured Superpriority Debt
Public Utility, Property, Plant and Equipment [Line Items]
Interest rate			1.46%	1.46%	1.46%
Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory balancing accounts			$ 2,999,000,000	$ 2,999,000,000	$ 2,999,000,000	$ 2,001,000,000
Composite depreciation rate					3.82%	3.76%	3.80%
AFUDC debt recorded					$ 56,000,000	$ 35,000,000	$ 55,000,000
AFUDC equity recorded					133,000,000	140,000,000	79,000,000
Nuclear decommissioning obligation accrued					3,900,000,000	5,100,000,000
Estimated cost recovery on spent nuclear fuel storage proceeding every year					7,600,000,000	10,600,000,000
Wildfire fund asset			461,000,000	461,000,000	461,000,000	464,000,000
Amortization and accretion					517,000,000	413,000,000	$ 0
Pacific Gas & Electric Co (Utility) | SBA Communications Corporation | Wireless Licenses
Public Utility, Property, Plant and Equipment [Line Items]
Duration of contract		100 years
Other tower, duration of contract		15 years
Proceeds from sale of transmission tower license		$ 946,000,000
Proceeds from sale of transmission tower license, closing	947,000,000
Proceeds from financing obligations	$ 370,000,000
Proceeds from contract liability		471,000,000
Proceeds from regulatory liabilities, noncurrent		$ 455,000,000
Pacific Gas & Electric Co (Utility) | Effective Date Towers | SBA Communications Corporation | Wireless Licenses | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Number of electric transmission towers | transmissionTower		700
Number of other electric transmission towers | transmissionTower		28,000
Pacific Gas & Electric Co (Utility) | Receivables Securitization Program
Public Utility, Property, Plant and Equipment [Line Items]
Aggregate maximum amount of loans made by lenders			1,000,000,000	1,000,000,000	1,000,000,000
Debt financial instrument			974,000,000	974,000,000	974,000,000	1,000,000,000
Long-term debt, gross			974,000,000	974,000,000	$ 974,000,000	1,000,000,000
Pacific Gas & Electric Co (Utility) | Diablo Canyon
Public Utility, Property, Plant and Equipment [Line Items]
Number of generation facilities | facility					2
Pacific Gas & Electric Co (Utility) | Humboldt Bay
Public Utility, Property, Plant and Equipment [Line Items]
Number of generation facilities | numberOfFatality					1
PG&E AR Facility, LLC (SPV) | Receivables Securitization Program
Public Utility, Property, Plant and Equipment [Line Items]
Accounts receivable, net			$ 3,300,000,000	$ 3,300,000,000	$ 3,300,000,000	$ 2,600,000,000