INCOME TAXES (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pacific Gas & Electric Co (Utility)
Federal statutory income tax rate	21.00%	21.00%	21.00%
State income tax (net of federal benefit)	19.10%	7.50%	7.90%
Effect of regulatory treatment of fixed asset differences	(44.90%)	2.80%	3.60%
Tax credits	(1.70%)	0.10%	0.10%
Bankruptcy and emergence	54.10%	0.00%	0.00%
Other, net	2.20%	(0.50%)	0.00%
Effective tax rate	49.80%	30.90%	32.60%
PG&E Corporation
Federal statutory income tax rate	21.00%	21.00%	21.00%
State income tax (net of federal benefit)	(15.30%)	7.50%	7.90%
Effect of regulatory treatment of fixed asset differences	39.00%	2.80%	3.60%
Tax credits	1.50%	0.10%	0.10%
Bankruptcy and emergence	(82.50%)	0.00%	0.00%
Other, net	(2.10%)	(0.60%)	(0.10%)
Effective tax rate	(38.40%)	30.80%	32.50%