INCOME TAXES (Schedule of Income Tax Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (5)	$ (10)	$ (105)
State	(8)	48	(70)
Deferred:
Federal	(2,264)	481	218
State	(1,009)	6	16
Tax credits	(6)	(14)	(4)
Income tax provision (benefit)	(3,292)	511	55
Pacific Gas & Electric Co
Current:
Federal	5	61	(105)
State	(7)	50	(66)
Deferred:
Federal	(2,278)	326	229
State	(1,009)	4	16
Tax credits	(6)	(14)	(4)
Income tax provision (benefit)	$ (3,295)	$ 427	$ 70