OTHER CONTINGENCIES AND COMMITMENTS (Ex Parte Communication Rules) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 05, 2019
Loss Contingencies [Line Items]
Settlement agreement, proposed payment to California General Fund		$ 2
Ex Parte Communications
Loss Contingencies [Line Items]
Settlement agreement, proposed penalty		10
Settlement agreement, proposed forgone revenue collection, 2019 GT&S rate case		5
Settlement agreement, proposed forgone revenue collection, 2020 GRC cycle		1
Settlement agreement, proposed compensation payments, San Bruno		1
Settlement agreement, proposed compensation payments, San Carlos		$ 1
Ex Parte Communications | Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Loss contingency liability	$ 4