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
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Income (loss) available for common shareholders	$ 569	$ 475
Weighted average common shares outstanding, basic (in shares)	1,991	1,986
Add incremental shares from assumed conversions:
Employee share-based compensation (in shares)	4	8
Equity Units (in shares)	137	140
Weighted average common share outstanding, diluted (in shares)	2,132	2,134
Total earnings (loss) per common share, diluted (in dollars per share)	$ 0.27	$ 0.22