SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,290	$ 5,118	$ 11,499	$ 10,916
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	3,852	3,690	7,971	7,848
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,438	1,428	3,528	3,068
Pacific Gas & Electric Co (Utility)
Disaggregation of Revenue [Abstract]
Total operating revenues	5,290	5,118	11,499	10,916
Pacific Gas & Electric Co (Utility) | Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	3,275	3,213	6,278	6,451
Regulatory balancing accounts	577	477	1,693	1,397
Total operating revenues	3,852	3,690	7,971	7,848
Pacific Gas & Electric Co (Utility) | Electric | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	1,404	1,213	2,693	2,707
Pacific Gas & Electric Co (Utility) | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	1,283	1,252	2,427	2,425
Pacific Gas & Electric Co (Utility) | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total operating revenues	375	322	728	672
Pacific Gas & Electric Co (Utility) | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total operating revenues	314	484	469	700
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total operating revenues	20	19	39	37
Pacific Gas & Electric Co (Utility) | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total operating revenues	(121)	(77)	(78)	(90)
Pacific Gas & Electric Co (Utility) | Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,021	853	3,708	2,880
Regulatory balancing accounts	417	575	(180)	188
Total operating revenues	1,438	1,428	3,528	3,068
Pacific Gas & Electric Co (Utility) | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	691	388	2,574	1,851
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	189	197	702	541
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total operating revenues	398	356	842	755
Pacific Gas & Electric Co (Utility) | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total operating revenues	$ (257)	$ (88)	$ (410)	$ (267)