INCOME TAXES (Schedule of Change in Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pacific Gas & Electric Co (Utility)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 570	$ 498	$ 437
Additions for tax position taken during a prior year	1	0	0
Reductions for tax position taken during a prior year	0	(1)	(23)
Additions for tax position taken during the current year	45	73	85
Settlements	0	0	(1)
Balance, end of period	616	570	498
PG&E Corporation
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	570	498	437
Additions for tax position taken during a prior year	1	0	0
Reductions for tax position taken during a prior year	0	(1)	(23)
Additions for tax position taken during the current year	45	73	85
Settlements	0	0	(1)
Balance, end of period	$ 616	$ 570	$ 498