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DEBT (Debtor In Possession ("DIP") Facilities) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Jan. 29, 2020
USD ($)
Apr. 03, 2019
USD ($)
Mar. 27, 2019
USD ($)
Feb. 01, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]              
Debtor-in-possession financing, classified as current $ 1,500,000,000           $ 0
Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Debtor-in-possession financing, classified as current 1,500,000,000           $ 0
Senior Secured Superpriority Debt | Line of Credit | DIP Credit Agreement              
Line of Credit Facility [Line Items]              
Amount arranged           $ 5,500,000,000  
Covenant terms, unstayed indebtedness, maximum amount 200,000,000            
Covenant terms, post-petition obligations liability, maximum amount $ 200,000,000            
Senior Secured Superpriority Debt | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Extension fee 0.0025            
Senior Secured Superpriority Debt | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co | LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.00%            
Senior Secured Superpriority Debt | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co | Federal Funds Effective Swap Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.50%            
Senior Secured Superpriority Debt | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co | Minimum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.00%            
DIP Revolving Facility | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.25%            
DIP Revolving Facility | Line of Credit | DIP Credit Agreement              
Line of Credit Facility [Line Items]              
Amount arranged         $ 3,500,000,000    
DIP Revolving Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Debtor-in-possession financing, classified as current         1,500,000,000    
Fee on unused borrowings based on average daily unutilized commitments 0.375%            
Fronting fee 0.125%            
DIP Revolving Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co | LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 2.25%            
DIP Revolving Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co | Base Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.25%            
Letter of Credit Subfacility | Line of Credit | DIP Credit Agreement              
Line of Credit Facility [Line Items]              
Amount arranged         1,500,000,000    
Letter of Credit Subfacility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Amount arranged       $ 1,500,000,000      
Letters of credit available         750,000,000    
DIP Initial Term Loan Facility | LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 2.25%            
DIP Initial Term Loan Facility | Line of Credit | DIP Credit Agreement              
Line of Credit Facility [Line Items]              
Amount arranged         1,500,000,000    
DIP Initial Term Loan Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Amount arranged     $ 1,500,000,000        
DIP Delayed Draw Term Loan Facility | LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 2.25%            
DIP Delayed Draw Term Loan Facility | Line of Credit | DIP Credit Agreement              
Line of Credit Facility [Line Items]              
Amount arranged         500,000,000    
DIP Delayed Draw Term Loan Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Amount arranged         350,000,000    
Repayments of debt     $ 350,000,000        
DIP Delayed Draw Term Loan Facility | Subsequent Event | DIP Credit Agreement | Pacific Gas & Electric Co              
Line of Credit Facility [Line Items]              
Amount arranged   $ 500,000,000          
DIP Incremental Facilities | Line of Credit | DIP Credit Agreement              
Line of Credit Facility [Line Items]              
Amount arranged         $ 4,000,000,000.0