Earnings Per Share (Reconciliation Of PG&E Corporation's Income Available For Common Shareholders And Weighted Average Shares Of Common Stock Outstanding For Calculating Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Income available for common shareholders	$ 1,646	$ 1,393	$ 874
Weighted average common shares outstanding, basic	512	499	484
Add Incremental Shares From Assumed conversions:
Employee share-based compensation	1	2	3
Weighted average common shares outstanding, diluted	513	501	487
Total earnings per common share, diluted	$ 3.21	$ 2.78	$ 1.79