DEBT (Schedule of Contractual Repayment Schedule) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Debt [Line Items]
Total consolidated debt	$ 37,589
Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	3.66%
Fixed rate obligations	$ 29,852
Variable rate obligations	$ 3,000
Pacific Gas & Electric Co (Utility) | 18-Months Term Loan
Debt [Line Items]
Debt Instrument, term	18 months
Pacific Gas & Electric Co (Utility) | 18-Months Term Loan | LIBOR
Debt [Line Items]
Debt, average interest rate	2.44%
Pacific Gas & Electric Co (Utility) | Receivables Securitization Program | LIBOR
Debt [Line Items]
Debt, average interest rate	1.57%
Pacific Gas & Electric Co (Utility) | First Mortgage Bonds, Stated Maturity 2022 | LIBOR
Debt [Line Items]
Debt, average interest rate	1.70%
PG&E Corporation
Debt [Line Items]
Average fixed interest rate	5.13%
Fixed rate obligations	$ 2,000
Variable interest rate as of December 31, 2020	5.50%
Variable rate obligations	$ 2,737
2021
Debt [Line Items]
Total consolidated debt	$ 28
2021 | Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	0.00%
Fixed rate obligations	$ 0
Variable interest rate as of December 31, 2020	0.00%
Variable rate obligations	$ 0
2021 | PG&E Corporation
Debt [Line Items]
Average fixed interest rate	0.00%
Fixed rate obligations	$ 0
Variable interest rate as of December 31, 2020	5.50%
Variable rate obligations	$ 28
2022
Debt [Line Items]
Total consolidated debt	$ 5,528
2022 | Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	1.75%
Fixed rate obligations	$ 2,500
Variable rate obligations	$ 3,000
2022 | PG&E Corporation
Debt [Line Items]
Average fixed interest rate	0.00%
Fixed rate obligations	$ 0
Variable interest rate as of December 31, 2020	5.50%
Variable rate obligations	$ 28
2023
Debt [Line Items]
Total consolidated debt	$ 1,203
2023 | Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	3.83%
Fixed rate obligations	$ 1,175
Variable interest rate as of December 31, 2020	0.00%
Variable rate obligations	$ 0
2023 | PG&E Corporation
Debt [Line Items]
Average fixed interest rate	0.00%
Fixed rate obligations	$ 0
Variable interest rate as of December 31, 2020	5.50%
Variable rate obligations	$ 28
2024
Debt [Line Items]
Total consolidated debt	$ 828
2024 | Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	3.60%
Fixed rate obligations	$ 800
Variable interest rate as of December 31, 2020	0.00%
Variable rate obligations	$ 0
2024 | PG&E Corporation
Debt [Line Items]
Average fixed interest rate	0.00%
Fixed rate obligations	$ 0
Variable interest rate as of December 31, 2020	5.50%
Variable rate obligations	$ 28
2025
Debt [Line Items]
Total consolidated debt	$ 4,100
2025 | Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	3.47%
Fixed rate obligations	$ 1,475
Variable interest rate as of December 31, 2020	0.00%
Variable rate obligations	$ 0
2025 | PG&E Corporation
Debt [Line Items]
Average fixed interest rate	0.00%
Fixed rate obligations	$ 0
Variable interest rate as of December 31, 2020	5.50%
Variable rate obligations	$ 2,625
Thereafter
Debt [Line Items]
Total consolidated debt	$ 25,902
Thereafter | Pacific Gas & Electric Co (Utility)
Debt [Line Items]
Average fixed interest rate	3.87%
Fixed rate obligations	$ 23,902
Variable interest rate as of December 31, 2020	0.00%
Variable rate obligations	$ 0
Thereafter | PG&E Corporation
Debt [Line Items]
Average fixed interest rate	5.13%
Fixed rate obligations	$ 2,000
Variable interest rate as of December 31, 2020	0.00%
Variable rate obligations	$ 0