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) - Entity [Domain] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income available for common shareholders	$ 402	$ 267	$ 433	$ 494
Weighted average common shares outstanding, basic	480	467	479	463
Employee share-based compensation	3	2	4	2
Weighted average common shares outstanding, diluted	483	469	483	465
Total earnings per common share, diluted	$ 0.83	$ 0.57	$ 0.90	$ 1.06