OTHER CONTINGENCIES AND COMMITMENTS (Locate and Mark) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 17, 2020	Dec. 05, 2019	Oct. 03, 2019
Loss Contingencies [Line Items]
Settlement agreement, proposed payment to California General Fund			$ 2
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Loss contingency liability	$ 44
Pacific Gas & Electric Co | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Settlement agreement, proposed penalty				$ 65
Settlement agreement, proposed payment to California General Fund				5
Settlement agreement, proposed payment to Shareholders' initiative fund				$ 60
Settlement agreement, compliance audits cost		$ 6
Settlement agreement, additional fine		$ 39