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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Income Available for Common Shareholders	$ 356	$ 397	$ 831	$ 517
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	5	8	5
Equity Units (in shares)	146	156	146	156
Weighted average common share outstanding, diluted (in shares)	2,141	2,146	2,141	2,146
Total income per common share, diluted (in dollars per share)	$ 0.17	$ 0.18	$ 0.39	$ 0.24