SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (10K Narrative) (Details) ft² in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) ft² facility	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Public Utility, Property, Plant and Equipment [Line Items]
Restricted cash	$ 297	$ 213
Period for probable revenue recovery	24 months
Wildfire Fund Asset
Public Utility, Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	15 years
Pacific Gas & Electric Co (Utility)
Public Utility, Property, Plant and Equipment [Line Items]
Restricted cash	$ 294	$ 213
Composite depreciation rate	3.56%	3.74%	3.82%
AFUDC debt recorded	$ 82	$ 81	$ 56
AFUDC equity recorded	$ 179	$ 184	$ 133
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) | Diablo Canyon
Public Utility, Property, Plant and Equipment [Line Items]
Number of generation facilities | facility	2