CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Discount on net issuances of commercial paper	$ 0	$ 2
Premium, discount, and issuance costs on proceeds from long-term debt	0	10
Pacific Gas & Electric Co
Discount on net issuances of commercial paper	0	2
Premium, discount, and issuance costs on proceeds from long-term debt	$ 0	$ 10

The cash inflow from borrowings payable greater than 12 months, net of premium, discount and cash paid to third parties in connection with debt origination

No definition available.

Name:	pcg_ProceedsFromIssuanceOfLongTermDebtDiscountAndIssuanceCosts
Namespace Prefix:	pcg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration