INCOME TAXES (Schedule of Income Tax Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 1	$ (5)	$ (10)
State	101	(8)	48
Deferred:
Federal	(2,361)	(2,264)	481
State	(1,136)	(1,009)	6
Tax credits	(5)	(6)	(14)
Income tax provision (benefit)	(3,400)	(3,292)	511
Pacific Gas & Electric Co
Current:
Federal	4	5	61
State	94	(7)	50
Deferred:
Federal	(2,363)	(2,278)	326
State	(1,137)	(1,009)	4
Tax credits	(5)	(6)	(14)
Income tax provision (benefit)	$ (3,407)	$ (3,295)	$ 427