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BANKRUPTCY FILING (Schedule of Debtor Reorganization Items) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reorganizations [Line Items]      
Debtor-in-possession financing costs $ 114    
Legal and other 292    
Interest income (60)    
Adjustments to LSTC 0    
Total reorganization items, net 346 $ 0 $ 0
PG&E Corporation      
Reorganizations [Line Items]      
Debtor-in-possession financing costs 17    
Legal and other 19    
Interest income (10)    
Adjustments to LSTC 0    
Total reorganization items, net 26 0 0
Pacific Gas & Electric Co      
Reorganizations [Line Items]      
Debtor-in-possession financing costs 97    
Legal and other 273    
Interest income (50)    
Adjustments to LSTC 0    
Total reorganization items, net $ 320 $ 0 $ 0