Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Financing Activities
Net issuances of commercial paper, discount	$ 6	$ 3	$ 2
Proceeds from issuance of long-term debt, net of premium, discount, and issuance costs	17	27	17
Pacific Gas And Electric Company [Member]
Cash Flows from Financing Activities
Net issuances of commercial paper, discount	6	3	2
Proceeds from issuance of long-term debt, net of premium, discount, and issuance costs	$ 17	$ 27	$ 14