BANKRUPTCY FILING (Equity Financing) (Details) - USD ($) $ / shares in Units, shares in Thousands			1 Months Ended	6 Months Ended
	Jul. 01, 2020	Jun. 25, 2020	Jul. 31, 2020	Jun. 30, 2020	Sep. 30, 2020	Aug. 03, 2020	Jun. 19, 2020	Mar. 06, 2020
Debt Instrument [Line Items]
Proceeds through the issuance of common stock and other equity-linked instruments		$ 3,970,000,000
Backstop commitment premium, expense				$ 1,100,000,000
Share price (in dollar per share)				$ 8.87
Additional backstop commitment premium, expense				$ 444,000,000
Professional legal fees				34,000,000
Professional non-legal fees				19,000,000
Professional fees				49,000,000
Purchase price							$ 523,000,000
Settlement price (in dollars per share)							$ 9.50
Expiration period		30 days
Backstop Parties
Debt Instrument [Line Items]
Debt commitment letters, required equity funding		$ 523,000,000						$ 12,000,000,000.0
Forward stock purchase agreement, common stock issues, pro rata (in shares)		50,000
Offerings
Debt Instrument [Line Items]
Proceeds through the issuance of common stock and other equity-linked instruments				5,750,000,000
Option Amount
Debt Instrument [Line Items]
Proceeds through the issuance of common stock and other equity-linked instruments				$ 523,000,000
Forecast
Debt Instrument [Line Items]
Additional backstop commitment premium, expense					$ 27,000,000
Additional forward stock purchase agreement, expense					$ 8,000,000
Subsequent event
Debt Instrument [Line Items]
Proceeds through the issuance of common stock and other equity-linked instruments	$ 9,000,000,000.0		$ 9,000,000,000.0
Equity backstop commitments, shares (in shares)	119,000
Equity backstop commitments, value	$ 12,000,000,000.0
Share price (in dollar per share)	$ 9.03
PG&E Corporation | Subsequent event
Debt Instrument [Line Items]
Forward stock purchase, redemption amount						$ 120,500,000
PG&E Corporation | Subsequent event | Backstop Parties
Debt Instrument [Line Items]
Transfer of common stock to counterparty (in shares)						42,300