EQUITY (Narrative) (Details) - USD ($)	Sep. 30, 2021	Jul. 09, 2021	Oct. 27, 2021	Jul. 08, 2021	Apr. 30, 2021	Dec. 31, 2020	Apr. 09, 2020
Schedule Of Changes In Equity [Line Items]
Common stock, shares outstanding (in shares)	1,985,369,201					1,984,678,673
Non-GAAP core earnings requirement to pay common dividends							$ 6,200,000,000
PG&E Corporation
Schedule Of Changes In Equity [Line Items]
Increase in common stock		$ 4,850,000,000
PG&E Corporation | Subsequent event
Schedule Of Changes In Equity [Line Items]
Common stock, shares outstanding, adjusted (in shares)			1,507,625,611
PG&E Corporation | Common Stock | Fire Victim Trust Share Exchange and Tax Matters Agreement
Schedule Of Changes In Equity [Line Items]
Transfer of shares to Fire Victim Trust (in shares)	477,743,590
Stock issued during period, shares, new issues (in shares)		477,743,590
PG&E Corporation | Common Stock | At The Market Equity Distribution Program
Schedule Of Changes In Equity [Line Items]
Sale of stock, number of shares issued in transaction, amount	$ 400,000,000				$ 400,000,000
PG&E Corporation | Minimum
Schedule Of Changes In Equity [Line Items]
Percentage of equity security ownership with board of director approval	4.75%			4.75%
PG&E Corporation | Minimum | Subsequent event
Schedule Of Changes In Equity [Line Items]
Percentage of equity security ownership with board of director approval			2.90%
PG&E Corporation | Maximum | Fire Victim Trust Share Exchange and Tax Matters Agreement
Schedule Of Changes In Equity [Line Items]
Common stock, shares authorized, reserve, additional shares due to nonconforming new shares (in shares)	250,000,000