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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities $ 16,921 $ 11,999
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers 433  
Authorized amount of shareholder tax benefits to be returned 7,590  
Federal Energy Regulatory Commission    
Regulatory Liabilities [Line Items]    
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers 302  
California Public Utilities Commission    
Regulatory Liabilities [Line Items]    
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers 131  
Cost of removal obligations    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 7,617 7,306
Recoveries in excess of AROs    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 0 388
Public purpose programs    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 1,117 946
Employee benefit plans    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 1,239 1,229
Transmission tower wireless licenses    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 433 446
SFGO sale    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 284 343
SB 901 Securitization    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities 5,380 0
Other    
Regulatory Liabilities [Line Items]    
Total long-term regulatory liabilities $ 851 $ 1,341