Condensed Consolidated Statements Of Cash Flows (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net issuances of commercial paper, discount	$ 1	$ 0
Proceeds from issuance of long-term debt, net of discount and issuance costs	13	0
Pacific Gas And Electric Company [Member]
Net issuances of commercial paper, discount	1	0
Proceeds from issuance of long-term debt, net of discount and issuance costs	$ 10	$ 0