Equity (Changes In Equity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Balance at December 31, 2016			$ 17,940
Balance at December 31, 2016			18,192
Comprehensive Income Net Of Tax	$ 411	$ 210	990	$ 320
Common stock issued			257
Share-based compensation			13
Common stock dividends declared			(528)
Preferred stock dividend requirement of subsidiary	(4)	(4)	(7)	(7)
Balance at June 30, 2017	18,891		18,891
Balance at June 30, 2017	18,639		18,639
Pacific Gas And Electric Company [Member]
Balance at December 31, 2016			18,395
Comprehensive Income Net Of Tax	409	210	979	318
Common stock issued			0
Share-based compensation			0
Common stock dividends declared			(514)
Preferred stock dividend requirement	(4)	$ (4)	(7)	(7)
Equity contributions			190	$ 280
Balance at June 30, 2017	$ 19,043		$ 19,043