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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Income (loss) available for common shareholders	$ 348	$ 456	$ 1,323	$ 1,287
Weighted average common shares outstanding, basic (in shares)	2,111	1,987	2,041	1,987
Add incremental shares from assumed conversions:
Employee share-based compensation (in shares)	6	8	6	8
Equity Units (in shares)	23	137	91	137
Weighted average common share outstanding, diluted (in shares)	2,140	2,132	2,138	2,132
Total earnings (loss) per common share, diluted (in dollars per share)	$ 0.16	$ 0.21	$ 0.62	$ 0.60