COMMON STOCK AND SHARE-BASED COMPENSATION (Narrative) (Details)						12 Months Ended			84 Months Ended
	Feb. 08, 2022 USD ($)	Jan. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Jul. 09, 2021 USD ($) shares	May 28, 2020	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($) shares	Feb. 04, 2022 shares	Jul. 08, 2021	Apr. 30, 2021 USD ($)	Jul. 01, 2020	Mar. 20, 2020 USD ($)
Schedule of Capitalization, Equity [Line Items]
Common stock, shares outstanding (in shares)			1,985,400,540			1,985,400,540	1,984,678,673		1,985,400,540
Treasury stock, shares at cost (in shares)			477,743,590			477,743,590	0		477,743,590
Shares outstanding (in shares)										2,463,891,104
Common stock, shares issued, reserve, additional shares due to nonconforming new shares (in shares)			0			0			0
Dividend reinstatement target, amount | $														$ 6,200,000,000
Equity capital structure percentage													52.00%
Equity capital structure, waiver period					5 years
Shares available for LTIP award (in shares)			58,552,722			58,552,722			58,552,722
Weighted average grant date fair value of granted shares (in dollars per share) | $ / shares						$ 11.01	$ 9.25	$ 18.57
Total fair value | $						$ 19,000,000	$ 31,000,000	$ 42,000,000
Total unrecognized compensation costs | $						$ 81,000,000
Remaining weighted average period						2 years 2 months 8 days
Subsequent Event
Schedule of Capitalization, Equity [Line Items]
Shares outstanding (in shares)										2,463,891,104
Common stock, shares outstanding, adjusted (in shares)										1,548,403,924
Percentage stock ownership limitation										0.0298
Cumulative and unpaid dividends | $		$ 59,100,000
Preferred stock dividend requirement | $	$ 3,500,000
Fire Victim Trust | Subsequent Event
Schedule of Capitalization, Equity [Line Items]
Number of shares exchanged (in shares)		40,000,000
2014 LTIP, Amended
Schedule of Capitalization, Equity [Line Items]
Number of shares issued for LTIP, maximum (in shares)			91,000,000			91,000,000			91,000,000
Stock Options
Schedule of Capitalization, Equity [Line Items]
Granted (in shares)						0	0
Weighted-average period						1 year 5 months 19 days
Stock Options | 2014 LTIP
Schedule of Capitalization, Equity [Line Items]
Term of award						10 years
Award vesting period						3 years
Total unrecognized compensation costs | $			$ 0			$ 0			$ 0
Granted (in shares)						0
Restricted stock units
Schedule of Capitalization, Equity [Line Items]
Award vesting period									3 years
Tax detriment | $						$ 11,000,000
Performance shares
Schedule of Capitalization, Equity [Line Items]
Award vesting period						3 years
Tax detriment | $						$ 19,000,000
Industry performance period						3 years
Award grant date fair value recognition period						3 years
Performance shares granted (in dollars per share) | $ / shares						$ 11.83	$ 9.62	$ 15.39
Employee service share based compensation nonvested performance shares total compensation cost not yet recognized | $						$ 50,000,000
PG&E ShareCo | Common Stock
Schedule of Capitalization, Equity [Line Items]
Stock issued during period, shares, new issues (in shares)						477,743,590
PG&E ShareCo | Fire Victim Trust Share Exchange and Tax Matters Agreement | Common Stock
Schedule of Capitalization, Equity [Line Items]
Stock issued during period, shares, new issues (in shares)				477,743,590
Transfer of shares to Fire Victim Trust (in shares)			477,743,590			477,743,590			477,743,590
PG&E Corporation
Schedule of Capitalization, Equity [Line Items]
Increase in common stock | $				$ 4,850,000,000
PG&E Corporation | Equity Units
Schedule of Capitalization, Equity [Line Items]
Stock issued during period, shares, new issues (in shares)							16,000,000
PG&E Corporation | Minimum
Schedule of Capitalization, Equity [Line Items]
Percentage of equity security ownership with board of director approval			4.75%			4.75%			4.75%		4.75%
PG&E Corporation | Minimum | Common Stock
Schedule of Capitalization, Equity [Line Items]
Amount of shares, right to receive							138,000,000
PG&E Corporation | Minimum | Revolving Credit Facility
Schedule of Capitalization, Equity [Line Items]
Debt, ratio of total consolidated debt to consolidated capitalization, loans outstanding balance													150.00%
Debt, ratio of total consolidated debt to consolidated capitalization, cash dividend declared													100.00%
PG&E Corporation | Maximum | Common Stock
Schedule of Capitalization, Equity [Line Items]
Amount of shares, right to receive							168,000,000
PG&E Corporation | Maximum | Revolving Credit Facility
Schedule of Capitalization, Equity [Line Items]
Debt, ratio of total consolidated debt to consolidated capitalization													70.00%
PG&E Corporation | Maximum | Fire Victim Trust Share Exchange and Tax Matters Agreement
Schedule of Capitalization, Equity [Line Items]
Common stock, shares authorized, reserve, additional shares due to nonconforming new shares (in shares)			250,000,000
PG&E Corporation | At The Market Equity Distribution Program | Common Stock
Schedule of Capitalization, Equity [Line Items]
Sale of stock, number of shares issued in transaction, amount | $			$ 400,000,000			$ 400,000,000			$ 400,000,000			$ 400,000,000