Equity (Changes In Equity) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Balance at December 31, 2013	$ 14,342
Balance at December 31, 2013	14,594
Comprehensive Income Net Of Tax	235	252
Common stock issued	307
Share-based compensation	12
Common stock dividends declared	(213)
Preferred stock dividend requirement of subsidiary	(3)	(3)
Balance at March 31, 2014	14,932
Balance at March 31, 2014	14,680
Pacific Gas And Electric Company [Member]
Balance at December 31, 2013	14,841
Comprehensive Income Net Of Tax	228	242
Common stock issued	0
Share-based compensation	(5)
Common stock dividends declared	(179)
Preferred stock dividend requirement	(3)	(3)
Equity contributions	250	370
Balance at March 31, 2014	$ 15,132