EARNINGS PER SHARE (Reconciliation of PG&E Corporation's Income Available for Common Shareholders and Weighted Average Shares of Common Stock Outstanding for Calculating Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Income (loss) available for common shareholders	$ 406	$ 356	$ 975	$ 831
Weighted average common shares outstanding, basic (in shares)	2,019	1,987	2,005	1,987
Add incremental shares from assumed conversions:
Employee share-based compensation (in shares)	6	8	6	8
Equity Units (in shares)	114	146	126	146
Weighted average common share outstanding, diluted (in shares)	2,139	2,141	2,137	2,141
Total earnings (loss) per common share, diluted (in dollars per share)	$ 0.19	$ 0.17	$ 0.46	$ 0.39