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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income available for common shareholders	$ 388	$ 307	$ 701	$ 740
Weighted average common shares outstanding, basic	501	486	497	481
Employee share-based compensation	2	3	3	3
Weighted average common shares outstanding, diluted	503	489	500	484
Total earnings per common share, diluted	$ 0.77	$ 0.63	$ 1.40	$ 1.53