Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Amortization of prior service cost, tax	$ 5	$ 5	$ 14	$ 15
Amortization of actuarial loss, tax	11	12	35	38
Amortizaiton of transition obligation, tax	0	2	0	6
Transfer to regulatory account, tax	13	14	39	44
Gain (loss) on investments, tax	2	0	13	0
Pacific Gas And Electric Company [Member]
Amortization of prior service cost, tax	5	5	14	15
Amortization of actuarial loss, tax	11	12	34	38
Amortizaiton of transition obligation, tax	0	2	0	6
Transfer to regulatory account, tax	$ 13	$ 14	$ 39	$ 44