CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Financing Activities
Discount on net issuances of commercial paper	$ 1	$ 5	$ 6
Premium, discount, and issuance costs on proceeds from long-term debt	7	32	17
Pacific Gas & Electric Co
Cash Flows from Financing Activities
Discount on net issuances of commercial paper	0	5	6
Premium, discount, and issuance costs on proceeds from long-term debt	$ 7	$ 32	$ 17