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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Income (Loss) Attributable to Common Shareholders	$ 456	$ (1,091)	$ 1,287	$ (574)
Weighted average common shares outstanding, basic (in shares)	1,987	1,985	1,987	1,985
Add incremental shares from assumed conversions:
Employee share-based compensation (in shares)	8	0	8	0
Equity Units (in shares)	137	0	137	0
Weighted average common share outstanding, diluted (in shares)	2,132	1,985	2,132	1,985
Total income (loss) per common share, diluted (in dollars per share)	$ 0.21	$ (0.55)	$ 0.60	$ (0.29)