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Condensed Consolidated Statements Of Cash Flows (Parenthetical) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Discount on net issuances of commercial paper $ 2 $ 1
Premium, discount, and issuance costs on proceeds from long-term debt 14 6
Pacific Gas And Electric Company [Member]    
Discount on net issuances of commercial paper 2 1
Premium, discount, and issuance costs on proceeds from long-term debt $ 14 $ 3