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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income available for common shareholders	$ 406	$ 206	$ 982	$ 313
Weighted average common shares outstanding, basic	511	497	510	495
Employee share-based compensation	2	1	2	2
Weighted average common shares outstanding, diluted	513	498	512	497
Total earnings per common share, diluted	$ 0.79	$ 0.41	$ 1.92	$ 0.63