EARNINGS PER SHARE (Reconciliation Of PG&E Corporation's Income Available For Common Shareholders And Weighted Average Common Shares Outstanding For Calculating Diluted EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Income available for common shareholders	$ 564	$ 550	$ 22	$ 1,532
Weighted average common shares outstanding, basic (in shares)	517	513	516	511
Add incremental shares from assumed conversions:
Employee share-based compensation (in shares)	0	3	1	3
Weighted average common shares outstanding, diluted (in shares)	517	516	517	514
Total earnings per common share, diluted (in dollars per share)	$ 1.09	$ 1.07	$ 0.04	$ 2.98