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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Feb. 28, 2022
Dec. 31, 2021
Regulatory Assets [Line Items]        
Regulatory assets $ 16,448     $ 9,207
Utility retained generation asset costs 1,200      
Customer Harm Threshold, post-emergence transaction, recovery bonds issued     $ 7,500  
Initial shareholder contribution 2,000      
Pension benefits        
Regulatory Assets [Line Items]        
Regulatory assets 519     708
Environmental compliance costs        
Regulatory Assets [Line Items]        
Regulatory assets 1,190     1,089
Utility retained generation        
Regulatory Assets [Line Items]        
Regulatory assets 98     133
Price risk management        
Regulatory Assets [Line Items]        
Regulatory assets 151     216
Catastrophic event memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets 998     1,119
Catastrophic event memorandum account | COVID-19        
Regulatory Assets [Line Items]        
Regulatory assets 40     49
Wildfire expense memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets 417     347
Fire hazard prevention memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets 77     75
Fire risk mitigation memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets 122     44
Wildfire mitigation plan memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets 623     424
Deferred income taxes        
Regulatory Assets [Line Items]        
Regulatory assets 2,527     1,849
Insurance premium costs        
Regulatory Assets [Line Items]        
Regulatory assets 168     207
Wildfire mitigation balancing account        
Regulatory Assets [Line Items]        
Regulatory assets $ 301     273
Wildfire mitigation balancing account | Minimum        
Regulatory Assets [Line Items]        
Cost percentage threshold requiring approval 115.00%      
Vegetation management balancing account        
Regulatory Assets [Line Items]        
Regulatory assets $ 1,994     1,411
Cost percentage threshold requiring approval 120.00%      
COVID-19 Pandemic protection memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets $ 32     49
COVID-19 pandemic protection memorandum account, undercollection bad debt        
Regulatory Assets [Line Items]        
Regulatory assets 10     30
COVID-19 pandemic protection memorandum account, program and accounts receivable financing costs        
Regulatory Assets [Line Items]        
Regulatory assets 22     19
Microgrid memorandum account        
Regulatory Assets [Line Items]        
Regulatory assets 192     163
Financing costs        
Regulatory Assets [Line Items]        
Regulatory assets 207     175
SB 901 Securitization        
Regulatory Assets [Line Items]        
Regulatory assets 5,439 $ 5,500   0
Recoveries in excess of AROs        
Regulatory Assets [Line Items]        
Regulatory assets 369     0
Other        
Regulatory Assets [Line Items]        
Regulatory assets $ 1,024     $ 925