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DEBT (Debtor In Possession ("DIP") Facilities and Financing) (Details)
Apr. 03, 2019
USD ($)
Mar. 31, 2019
USD ($)
Feb. 01, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]          
Debtor-in-possession financing   $ 350,000,000     $ 0
Commercial Paper   0      
Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Debtor-in-possession financing   350,000,000     0
Commercial Paper   0      
Senior Secured Superpriority Debt | Line of Credit | DIP Credit Agreement          
Line of Credit Facility [Line Items]          
Amount arranged     $ 5,500,000,000.0 $ 5,500,000,000  
DIP Revolving Facility | Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Letters of Credit Outstanding   80,000,000      
Borrowings Against DIP Revolving Facility   2,965,000,000     $ 2,965,000,000
DIP Revolving Facility | DIP Credit Agreement | Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Limit   1,500,000,000.0      
Letters of Credit Outstanding   131,000,000      
Borrowings Against DIP Revolving Facility   350,000,000      
Availability   $ 1,019,000,000      
Extension fee   0.25      
DIP Revolving Facility | Line of Credit | DIP Credit Agreement          
Line of Credit Facility [Line Items]          
Amount arranged     3,500,000,000.0    
DIP Revolving Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Debtor-in-possession financing     1,500,000,000.0    
Letter of Credit Subfacility | Line of Credit | DIP Credit Agreement          
Line of Credit Facility [Line Items]          
Amount arranged     1,500,000,000.0    
Letter of Credit Subfacility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Amount arranged     1,500,000,000.0    
Letters of credit available     750,000,000    
DIP Initial Term Loan Facility | Line of Credit | DIP Credit Agreement          
Line of Credit Facility [Line Items]          
Amount arranged     1,500,000,000.0    
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    
Subsequent Event | DIP Initial Term Loan Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Amount arranged $ 1,500,000,000.0        
Subsequent Event | DIP Delayed Draw Term Loan Facility | Line of Credit | DIP Credit Agreement | Pacific Gas & Electric Co          
Line of Credit Facility [Line Items]          
Repayments of debt $ 350,000,000