CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Financing Activities
Discount on net issuances of commercial paper	$ 0	$ 1	$ 5
Premium, discount, and issuance costs on proceeds from long-term debt	0	7	32
Pacific Gas & Electric Co
Cash Flows from Financing Activities
Discount on net issuances of commercial paper	0	0	5
Premium, discount, and issuance costs on proceeds from long-term debt	$ 0	$ 7	$ 32