SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,861	$ 6,209
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,052	4,119
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,809	2,090
Pacific Gas & Electric Co (Utility)
Disaggregation of Revenue [Abstract]
Total operating revenues	5,861	6,209
Pacific Gas & Electric Co (Utility) | Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,043	3,003
Regulatory balancing accounts	9	1,116
Total operating revenues	4,052	4,119
Pacific Gas & Electric Co (Utility) | Electric | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	1,799	1,289
Pacific Gas & Electric Co (Utility) | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	1,505	1,144
Pacific Gas & Electric Co (Utility) | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total operating revenues	413	353
Pacific Gas & Electric Co (Utility) | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total operating revenues	180	155
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total operating revenues	25	19
Pacific Gas & Electric Co (Utility) | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total operating revenues	121	43
Pacific Gas & Electric Co (Utility) | Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	2,301	2,687
Regulatory balancing accounts	(492)	(597)
Total operating revenues	1,809	2,090
Pacific Gas & Electric Co (Utility) | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	1,517	1,883
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	373	513
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total operating revenues	475	444
Pacific Gas & Electric Co (Utility) | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total operating revenues	$ (64)	$ (153)