Equity (Changes In Equity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Balance at December 31, 2016	$ 17,940
Balance at December 31, 2016	18,192
Comprehensive Income Net Of Tax	579	$ 110
Common stock issued	150
Share-based compensation	56
Common stock dividends declared	(257)
Preferred stock dividend requirement of subsidiary	(3)	(3)
Balance at March 31, 2017	18,605
Balance at March 31, 2017	18,353
Pacific Gas And Electric Company [Member]
Balance at December 31, 2016	18,395
Comprehensive Income Net Of Tax	570	108
Common stock issued	0
Share-based compensation	0
Common stock dividends declared	(244)
Preferred stock dividend requirement	(3)	(3)
Equity contributions	125	$ 65
Balance at March 31, 2017	$ 18,843