Equity (Changes In Equity) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Balance at December 31, 2016			$ 17,940
Balance at December 31, 2016			18,192
Comprehensive Income Net Of Tax	$ 553	$ 391	1,543	$ 711
Common stock issued			361
Share-based compensation			(2)
Common stock dividends declared			(802)
Preferred stock dividend requirement of subsidiary	(3)	(3)	(10)	(10)
Balance at September 30, 2017	19,286		19,286
Balance at September 30, 2017	19,034		19,034
Pacific Gas And Electric Company [Member]
Balance at December 31, 2016			18,395
Comprehensive Income Net Of Tax	513	389	1,492	707
Common stock issued			0
Share-based compensation			0
Common stock dividends declared			(784)
Preferred stock dividend requirement	(3)	$ (3)	(10)	(10)
Equity contributions			405	$ 740
Balance at September 30, 2017	$ 19,498		$ 19,498