BANKRUPTCY FILING (Schedule of Debtor Reorganization Items) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reorganizations [Line Items]
Debtor-in-possession financing costs	$ 0	$ 3
Legal and other	3	179
Other	(3)
Interest income		(6)
Total reorganization items, net	0	176
PG&E Corporation
Reorganizations [Line Items]
Debtor-in-possession financing costs	0	0
Legal and other	(2)	84
Other	0
Interest income		(1)
Total reorganization items, net	(2)	83
Utility
Reorganizations [Line Items]
Debtor-in-possession financing costs	0	3
Legal and other	5	95
Other	(3)
Interest income		(5)
Total reorganization items, net	$ 2	$ 93