Condensed Consolidated Statements Of Cash Flows (Parenthetical) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net issuances of commercial paper, discount	$ 1	$ 2
Proceeds from issuance of long-term debt, net of premium, discount, and issuance costs	8	6
Pacific Gas And Electric Company [Member]
Net issuances of commercial paper, discount	1	2
Proceeds from issuance of long-term debt, net of premium, discount, and issuance costs	$ 8	$ 6