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Consolidated Statements Of Cash Flows (Parenthetical) - Pacific Gas And Electric Company [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows from Financing Activities      
Net issuances of commercial paper, discount $ 3 $ 2 $ 2
Proceeds from issuance of long-term debt, net of premium, discount, and issuance costs $ 27 $ 14 $ 18