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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income available for common shareholders	$ 206	$ 402	$ 313	$ 433
Weighted average common shares outstanding, basic	497	480	495	479
Employee share-based compensation	1	3	2	4
Weighted average common shares outstanding, diluted	498	483	497	483
Total earnings per common share, diluted	$ 0.41	$ 0.83	$ 0.63	$ 0.90