Equity (Changes In Equity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Balance at December 31, 2014	$ 16,576
Balance at December 31, 2014	16,828
Comprehensive Income Net Of Tax	110	$ 17
Common stock issued	152
Share-based compensation	6
Common stock dividends declared	(229)
Preferred stock dividend requirement of subsidiary	(3)	(3)
Balance at September 30, 2015	16,864
Balance at September 30, 2015	16,612
Pacific Gas And Electric Company [Member]
Balance at December 31, 2014	17,060
Comprehensive Income Net Of Tax	108	4
Common stock issued	0
Share-based compensation	0
Common stock dividends declared	(179)
Preferred stock dividend requirement	(3)	(3)
Equity contributions	65	$ 100
Balance at September 30, 2015	$ 17,051