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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Discount on net issuances of commercial paper $ 1 $ 3
Premium, discount, and issuance costs on proceeds from long-term debt 0 11
Pacific Gas & Electric Co    
Discount on net issuances of commercial paper 0 3
Premium, discount, and issuance costs on proceeds from long-term debt $ 0 $ 11