OTHER CONTINGENCIES AND COMMITMENTS (Locate and Mark) (Details) - USD ($) $ in Millions	Jul. 21, 2020	Jun. 30, 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
Unfavorable Regulatory Action | Subsequent event
Loss Contingencies [Line Items]
Settlement agreement, additional fine	$ 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