PREFERRED STOCK (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 22, 2020
Preferred Stock [Line Items]
Preferred stock, shares authorized (in shares)				400,000,000
Pacific Gas & Electric Co (Utility)
Preferred Stock [Line Items]
Preferred stock dividend	$ 0	$ 0	$ 0
Pacific Gas & Electric Co (Utility) | Minimum
Preferred Stock [Line Items]
Redemption price (in dollars per share)	$ 25.75	$ 25.75
Pacific Gas & Electric Co (Utility) | Maximum
Preferred Stock [Line Items]
Redemption price (in dollars per share)	$ 27.25	$ 27.25
Pacific Gas & Electric Co (Utility) | Nonredeemable Preferred Stock
Preferred Stock [Line Items]
Nonredeemable preferred stock outstanding	$ 145,000,000	$ 145,000,000
Preferred stock dividends per share, low range (in dollars per share)	$ 1.25
Preferred stock dividends per share, high range (in dollars per share)	$ 1.50
Pacific Gas & Electric Co (Utility) | Nonredeemable Preferred Stock | Minimum
Preferred Stock [Line Items]
Preferred stock interest rate	5.00%	5.00%
Pacific Gas & Electric Co (Utility) | Nonredeemable Preferred Stock | Maximum
Preferred Stock [Line Items]
Preferred stock interest rate	6.00%	6.00%
Pacific Gas & Electric Co (Utility) | Redeemable Preferred Stock
Preferred Stock [Line Items]
Redeemable preferred stock outstanding	$ 113,000,000	$ 113,000,000
Preferred stock dividends per share, low range (in dollars per share)	$ 1.09
Preferred stock dividends per share, high range (in dollars per share)	$ 1.25
Pacific Gas & Electric Co (Utility) | Redeemable Preferred Stock | Minimum
Preferred Stock [Line Items]
Preferred stock interest rate	4.36%	4.36%
Pacific Gas & Electric Co (Utility) | Redeemable Preferred Stock | Maximum
Preferred Stock [Line Items]
Preferred stock interest rate	5.00%	5.00%
PG&E Corporation
Preferred Stock [Line Items]
Preferred stock, shares authorized (in shares)	400,000,000
Preferred stock, shares outstanding (in shares)	0
$100 Par Value | Pacific Gas & Electric Co (Utility)
Preferred Stock [Line Items]
Preferred stock, shares authorized (in shares)	10,000,000
Preferred stock, shares outstanding (in shares)	0
Preferred stock, par value (in dollars per share)	$ 100
$25 Par Value | Pacific Gas & Electric Co (Utility)
Preferred Stock [Line Items]
Preferred stock, shares authorized (in shares)	75,000,000
Preferred stock, par value (in dollars per share)	$ 25