CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Financing Activities
Issuance costs for short-term debt	$ 1	$ 2	$ 0
Premium, discount, and issuance costs on proceeds from long-term debt	43	178	0
Pacific Gas & Electric Co (Utility)
Cash Flows from Financing Activities
Issuance costs for short-term debt	1	2	0
Premium, discount, and issuance costs on proceeds from long-term debt	$ 43	$ 88	$ 0