BANKRUPTCY FILING (Schedule of Debtor Reorganization Items) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reorganizations [Line Items]
Debtor-in-possession financing costs		$ 0	$ 0	$ 3
Legal and other		145	20	1,949
Interest income		(8)	(9)	(15)
Total reorganization items, net	$ 0	137	11	1,937
Equity backstop premium expense, bridge loan facility fees, and trustee fees		1,500		1,500
PG&E Corporation
Reorganizations [Line Items]
Debtor-in-possession financing costs		0	0	0
Legal and other		55	(1)	1,653
Interest income		0	0	(2)
Total reorganization items, net		55	(1)	1,651
Utility
Reorganizations [Line Items]
Debtor-in-possession financing costs		0	0	3
Legal and other		90	21	296
Interest income		(8)	(9)	(13)
Total reorganization items, net	$ 0	$ 82	$ 12	$ 286