DEBT (Schedule of Long-term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Debt [Line Items]
Total PG&E Corporation Consolidated Debt Subject to Compromise	$ 22,176	$ 22,075
Debtor reorganization items, write-off of debt issuance costs and debt discounts	(178)
Pacific Gas & Electric Co
Debt [Line Items]
Unamortized discount, net of premium and debt issuance costs	0	(178)
Total Senior notes, net of premium and debt issuance costs	17,525	17,347
Pollution control bonds	863	863
Total Borrowings under Pre-Petition Credit Facility Subject to Compromise	3,138	3,215
Total PG&E Corporation Consolidated Debt Subject to Compromise	21,526	21,425
Liabilities subject to compromise, accrued interest	(286)
Post-petition interest expense	638
PG&E Corporation
Debt [Line Items]
Total Senior notes, net of premium and debt issuance costs	650	650
Total PG&E Corporation Consolidated Debt Subject to Compromise	0	0
Liabilities subject to compromise, accrued interest	(1)
Post-petition interest expense	$ 15
Senior Notes Due 2022 \| Pacific Gas & Electric Co
Debt [Line Items]
Stated interest rate	2.45%
Senior notes	$ 400	400
Borrowings under Pre-Petition Credit Facilities	(2,888)	(2,965)
Undrawn letters of credit	$ 22
Senior Notes Due 2022 \| Pacific Gas & Electric Co \| LIBOR
Debt [Line Items]
Stated interest rate	3.04%
Senior Notes Due 2022 \| PG&E Corporation
Debt [Line Items]
Senior notes	$ 300	300
Senior Notes Due 2022 \| PG&E Corporation \| LIBOR
Debt [Line Items]
Stated interest rate	3.24%
Senior Notes Due 2020 \| Pacific Gas & Electric Co
Debt [Line Items]
Stated interest rate	3.50%
Senior notes	$ 800	800
Senior Notes Due 2020 \| PG&E Corporation
Debt [Line Items]
Total Senior notes, net of premium and debt issuance costs	$ 350	350
Senior Notes Due 2020 \| PG&E Corporation \| LIBOR
Debt [Line Items]
Stated interest rate	2.96%
Senior Notes Due 2021 \| Pacific Gas & Electric Co
Debt [Line Items]
Senior notes	$ 550	550
Senior Notes Due 2021 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	3.25%
Senior Notes Due 2021 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	4.25%
Seniors Note Due 2023 \| Pacific Gas & Electric Co
Debt [Line Items]
Senior notes	$ 1,175	1,175
Seniors Note Due 2023 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	3.25%
Seniors Note Due 2023 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	4.25%
Senior Notes Due 2024 Through 2028 \| Pacific Gas & Electric Co
Debt [Line Items]
Senior notes	$ 3,850	3,850
Senior Notes Due 2024 Through 2028 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	2.95%
Senior Notes Due 2024 Through 2028 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	4.65%
Senior Notes Due 2034 Through 2040 \| Pacific Gas & Electric Co
Debt [Line Items]
Senior notes	$ 5,700	5,700
Senior Notes Due 2034 Through 2040 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	5.40%
Senior Notes Due 2034 Through 2040 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	6.35%
Senior Notes Due 2041 Through 2042 \| Pacific Gas & Electric Co
Debt [Line Items]
Senior notes	$ 1,000	1,000
Senior Notes Due 2041 Through 2042 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	3.75%
Senior Notes Due 2041 Through 2042 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	4.50%
Senior Notes Due 2043 \| Pacific Gas & Electric Co
Debt [Line Items]
Stated interest rate	4.60%
Senior notes	$ 375	375
Senior Notes Due 2043 \| Pacific Gas & Electric Co
Debt [Line Items]
Stated interest rate	5.13%
Senior notes	$ 500	500
Senior Notes Due 2024 through 2047 \| Pacific Gas & Electric Co
Debt [Line Items]
Senior notes	$ 3,175	3,175
Senior Notes Due 2024 through 2047 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	3.95%
Senior Notes Due 2024 through 2047 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	4.75%
Pollution Control Bonds Series 2008, F, And 2010, E, 1.75%, Due 2026 \| Pacific Gas & Electric Co
Debt [Line Items]
Stated interest rate	1.75%
Pollution control bonds	$ 100	100
Pollution Control Bonds Series 2009, A-B, Variable Rate, Due 2026 \| Pacific Gas & Electric Co
Debt [Line Items]
Stated interest rate	7.95%
Pollution control bonds	$ 149	149
Pollution Control Bonds, Series 1996 C,E,F 1997 B, Variable Rates, Due 2026 \| Pacific Gas & Electric Co
Debt [Line Items]
Pollution control bonds	$ 614	614
Pollution Control Bonds, Series 1996 C,E,F 1997 B, Variable Rates, Due 2026 \| Pacific Gas & Electric Co \| Minimum
Debt [Line Items]
Stated interest rate	7.95%
Pollution Control Bonds, Series 1996 C,E,F 1997 B, Variable Rates, Due 2026 \| Pacific Gas & Electric Co \| Maximum
Debt [Line Items]
Stated interest rate	8.08%
Senior Notes Due 2019 \| Pacific Gas & Electric Co
Debt [Line Items]
Total Senior notes, net of premium and debt issuance costs	$ 250	$ 250
Senior Notes Due 2019 \| Pacific Gas & Electric Co \| LIBOR
Debt [Line Items]
Stated interest rate	2.36%

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