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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - 10Q Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
employee
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
employee
Sep. 30, 2021
USD ($)
Jul. 20, 2022
USD ($)
May 10, 2022
USD ($)
Nov. 12, 2021
USD ($)
Dec. 31, 2020
USD ($)
Public Utility, Property, Plant and Equipment [Line Items]                  
Period for probable revenue recovery       24 months          
Monte carlo simulation, historical data, period       12 years          
Litigation liability, current   $ 193   $ 193          
Wildfire Fund asset $ 461 461   461          
Litigation contribution, net   5,000   5,000          
Amortization and accretion   118 $ 162 353 $ 399        
Insurance receivable 1,247 $ 1,120   $ 1,120          
Number of eligible employees | employee   470   470          
Credit losses       $ 126          
Asset retirement obligation 5,300               $ 6,400
Decrease in decommissioning cost 1,300                
Decommissioning cost estimate 4,000                
Decrease in decommissioning cost, un-escalated 378                
Decrease in decommissioning cost, escalated 2,600                
Increase in asset retirement obligation       925          
One-time Termination Benefits                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Severance costs   $ 77              
Credits to employee retirement health savings accounts   22              
Regulatory Balancing Accounts Receivable                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Total regulatory balancing accounts 2,999 3,037   3,037          
Regulatory Balancing Accounts Receivable | Residential uncollectibles balancing accounts                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Total regulatory balancing accounts 127 109   109          
COVID-19 Pandemic protection memorandum account                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Regulatory assets   10   10          
FERC                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Regulatory assets   10   10          
2021 Dixie fire                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Insurance receivable 563 553   $ 553          
Wildfire Fund Asset                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Finite-lived intangible asset, useful life       15 years          
Other Current Liabilities                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Wildfire fund, noncurrent   1,100   $ 1,100          
Other noncurrent assets – other | 2021 Dixie fire                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Insurance receivable   150   150          
Pacific Gas & Electric Co (Utility)                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Wildfire Fund asset 461 461   461          
Amortization and accretion   118 $ 162 353 $ 399        
Receivables Securitization Program | Pacific Gas & Electric Co (Utility)                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Outstanding borrowings 974 1,325   1,325          
Receivables Securitization Program | PG&E AR Facility, LLC (SPV)                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Accounts receivable, net 3,300 3,300   3,300          
Recovery Bonds | Secured Debt                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Debt instrument, face amount $ 860 842   842       $ 860  
Recovery Bonds | Secured Debt | Tranche One                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Debt instrument, face amount               $ 266  
Interest rate               1.46%  
Recovery Bonds | Secured Debt | Tranche Two                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Debt instrument, face amount               $ 160  
Interest rate               2.28%  
Recovery Bonds | Secured Debt | Tranche Three                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Debt instrument, face amount               $ 434  
Interest rate               2.82%  
SB 901 Securitization | Secured Debt                  
Public Utility, Property, Plant and Equipment [Line Items]                  
Debt instrument, face amount   $ 7,500   $ 7,500   $ 3,900 $ 3,600