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DEBT (Long-term Debt) (Details) - USD ($)
Jul. 01, 2020
Jun. 23, 2020
Sep. 30, 2020
Jun. 19, 2020
PG&E Corporation        
Debt [Line Items]        
Debt instrument, redemption price, percentage   100.00%    
Floating Rate First Mortgage Bonds due June 16, 2022 | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount       $ 500,000,000
First Mortgage Bonds due June 16, 2022 | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount       $ 2,500,000,000
Stated interest rate       1.75%
First Mortgage Bonds due August 1, 2027 | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount       $ 1,000,000,000
Stated interest rate       2.10%
First Mortgage Bonds due February 1, 2031 | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount       $ 2,000,000,000
Stated interest rate       2.50%
First Mortgage Bonds due August 1, 2040 | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount       $ 1,000,000,000
Stated interest rate       3.30%
First Mortgage Bonds due August 1, 2050 | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount       $ 1,925,000,000
Stated interest rate       3.50%
New Mortgage Bonds | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount $ 11,900,000,000      
Utility Reinstated Senior Notes | Pacific Gas & Electric Co        
Debt [Line Items]        
Debt instrument, face amount 9,600,000,000      
18-Month Term Loan Facility | Pacific Gas & Electric Co        
Debt [Line Items]        
Line of credit facility, maximum borrowing capacity $ 1,500,000,000      
Debt instrument, term 18 months      
18-Month Term Loan Facility | Pacific Gas & Electric Co | London Interbank Offered Rate (LIBOR)        
Debt [Line Items]        
Debt instrument, basis spread on variable rate 2.25%      
Term Loan | PG&E Corporation        
Debt [Line Items]        
Debt instrument, face amount   $ 2,750,000,000    
Debt instrument, quarterly reduction amount     $ 6,875,000  
Prepayment premium percentage   1.00%    
Term Loan | PG&E Corporation | London Interbank Offered Rate (LIBOR)        
Debt [Line Items]        
Debt instrument, basis spread on variable rate   4.50%    
Debt instrument, basis spread on alternative base rate   1.00%    
Term Loan | PG&E Corporation | Alternative Base Rate (ABR)        
Debt [Line Items]        
Debt instrument, basis spread on variable rate   3.50%    
Term Loan | PG&E Corporation | Prime Rate        
Debt [Line Items]        
Debt instrument, basis spread on alternative base rate   0.50%    
Term Loan | PG&E Corporation | Minimum | London Interbank Offered Rate (LIBOR)        
Debt [Line Items]        
Debt instrument, basis spread on variable rate   1.00%    
Term Loan | PG&E Corporation | Minimum | Alternative Base Rate (ABR)        
Debt [Line Items]        
Debt instrument, basis spread on variable rate   2.00%    
Term Loan | PG&E Corporation | Maximum        
Debt [Line Items]        
Debt default, amount   $ 200,000,000    
Term Loan | Pacific Gas & Electric Co        
Debt [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 3,000,000,000  
Percentage of ownership of outstanding common stock   100.00%    
Senior Secured Notes due July 1, 2028 | PG&E Corporation        
Debt [Line Items]        
Debt instrument, face amount   $ 1,000,000,000.0    
Stated interest rate   5.00%    
Senior Secured Notes due July 1, 2030 | PG&E Corporation        
Debt [Line Items]        
Debt instrument, face amount   $ 1,000,000,000.0    
Stated interest rate   5.25%    
Senior Notes | PG&E Corporation        
Debt [Line Items]        
Debt instrument, redemption price, percentage   40.00%