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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,394	$ 5,465	$ 16,310	$ 15,396
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	3,895	4,181	11,743	11,527
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,499	1,284	4,567	3,869
Pacific Gas & Electric Co (Utility)
Disaggregation of Revenue [Abstract]
Total operating revenues	5,394	5,465	16,310	15,396
Pacific Gas & Electric Co (Utility) | Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	5,285	4,630	11,735	11,113
Regulatory balancing accounts	(1,390)	(449)	8	414
Total operating revenues	3,895	4,181	11,743	11,527
Pacific Gas & Electric Co (Utility) | Electric | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	2,128	1,962	4,834	4,778
Pacific Gas & Electric Co (Utility) | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	1,711	1,580	4,135	3,776
Pacific Gas & Electric Co (Utility) | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total operating revenues	534	467	1,206	1,099
Pacific Gas & Electric Co (Utility) | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total operating revenues	777	655	1,477	1,238
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total operating revenues	20	18	57	53
Pacific Gas & Electric Co (Utility) | Electric | Other
Disaggregation of Revenue [Abstract]
Total operating revenues	115	(52)	26	169
Pacific Gas & Electric Co (Utility) | Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	926	736	3,806	3,234
Regulatory balancing accounts	573	548	761	635
Total operating revenues	1,499	1,284	4,567	3,869
Pacific Gas & Electric Co (Utility) | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	392	295	2,243	1,921
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	162	102	703	486
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total operating revenues	356	323	1,111	995
Pacific Gas & Electric Co (Utility) | Natural gas | Other
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 16	$ 16	$ (251)	$ (168)

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