OTHER CONTINGENCIES AND COMMITMENTS (Disallowance of Capital Expenditures) (Details) - Disallowance of Plant Costs - USD ($) $ in Millions		1 Months Ended
	Jun. 23, 2016	Jun. 30, 2020	Jun. 01, 2020
Loss Contingencies [Line Items]
Gas transmission and storage capital disallowance	$ 696
Permanently disallowed capital	$ 120
Amount subject to audit		$ 576
Capital expenditures for future recovery			$ 512