Equity (Changes In Equity) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Balance at December 31, 2013			$ 14,342
Balance at December 31, 2013			14,594
Comprehensive Income Net Of Tax	796	165	1,291	769
Common stock issued			759
Share-based compensation			41
Common stock dividends declared			(644)
Preferred stock dividend requirement of subsidiary	(3)	(3)	(10)	(10)
Balance at September 30, 2014	16,031		16,031
Balance at September 30, 2014	15,779		15,779
Pacific Gas And Electric Company [Member]
Balance at December 31, 2013			14,841
Comprehensive Income Net Of Tax	793	166	1,271	741
Common stock issued			0
Share-based compensation			(5)
Common stock dividends declared			(537)
Preferred stock dividend requirement	(3)	(3)	(10)	(10)
Equity contributions			705	835
Balance at September 30, 2014	$ 16,265		$ 16,265