Equity (Changes In Equity) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Balance at December 31, 2013			$ 14,342
Balance at December 31, 2013			14,594
Comprehensive Income Net Of Tax	260	352	495	604
Common stock issued			599
Share-based compensation			27
Common stock dividends declared			(428)
Preferred stock dividend requirement of subsidiary	(4)	(4)	(7)	(7)
Balance at June 30, 2014	15,280		15,280
Balance at June 30, 2014	15,028		15,028
Pacific Gas And Electric Company [Member]
Balance at December 31, 2013			14,841
Comprehensive Income Net Of Tax	250	333	478	575
Common stock issued			0
Share-based compensation			(5)
Common stock dividends declared			(358)
Preferred stock dividend requirement	(4)	(4)	(7)	(7)
Equity contributions			580	665
Balance at June 30, 2014	$ 15,529		$ 15,529