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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Abstract]      
Total operating revenues $ 21,680 $ 20,642 $ 18,469
Electric      
Disaggregation of Revenue [Abstract]      
Total operating revenues 15,060 15,131 13,858
Natural gas      
Disaggregation of Revenue [Abstract]      
Total operating revenues 6,620 5,511 4,611
Pacific Gas & Electric Co (Utility)      
Disaggregation of Revenue [Abstract]      
Total operating revenues 21,680 20,642 18,469
Pacific Gas & Electric Co (Utility) | Electric      
Disaggregation of Revenue [Abstract]      
Total operating revenues 14,832 14,178  
Regulatory balancing accounts 228 953  
Total operating revenues 15,060 15,131 13,858
Pacific Gas & Electric Co (Utility) | Electric | Residential      
Disaggregation of Revenue [Abstract]      
Total operating revenues 6,130 6,089  
Pacific Gas & Electric Co (Utility) | Electric | Commercial      
Disaggregation of Revenue [Abstract]      
Total operating revenues 5,416 5,042  
Pacific Gas & Electric Co (Utility) | Electric | Industrial      
Disaggregation of Revenue [Abstract]      
Total operating revenues 1,626 1,493  
Pacific Gas & Electric Co (Utility) | Electric | Agricultural      
Disaggregation of Revenue [Abstract]      
Total operating revenues 1,830 1,565  
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting      
Disaggregation of Revenue [Abstract]      
Total operating revenues 77 73  
Pacific Gas & Electric Co (Utility) | Electric | Other, net      
Disaggregation of Revenue [Abstract]      
Total operating revenues (247) (84)  
Pacific Gas & Electric Co (Utility) | Natural gas      
Disaggregation of Revenue [Abstract]      
Total operating revenues 6,055 4,958  
Regulatory balancing accounts 565 553  
Total operating revenues 6,620 5,511 $ 4,611
Pacific Gas & Electric Co (Utility) | Natural gas | Residential      
Disaggregation of Revenue [Abstract]      
Total operating revenues 3,353 2,759  
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial      
Disaggregation of Revenue [Abstract]      
Total operating revenues 1,005 713  
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only      
Disaggregation of Revenue [Abstract]      
Total operating revenues 1,534 1,346  
Pacific Gas & Electric Co (Utility) | Natural gas | Other, net      
Disaggregation of Revenue [Abstract]      
Total operating revenues $ 163 $ 140