SEGMENT INFORMATION - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 7,194	$ 6,005
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	3,087	2,841
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	2,607	3,003
Eliminations and Unallocated in Consolidation [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	1,500	161
United States [Member] | Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	2,919	2,668
Canada [Member] | Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 168	$ 173