SEGMENT INFORMATION - Schedule of Reconciliation of Operating Earnings from Segment to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total consolidated operating earnings	$ 380	$ 344	$ 743	$ 679
Assets	5,992		5,992		$ 5,873
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	409	376	798	749
Assets	2,797		2,797		2,684
Eliminations and Unallocated in Consolidation [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	(29)	(32)	(55)	(70)
Assets	108		108		310
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Assets	3,087		3,087		2,879
United States And Canada Segments [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	382	335	741	672
United States And Canada Segments [Member] | Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	382	335	741	672
Other Businesses [Member] | Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	27	41	57	77
United States [Member] | Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	381	349	745	706
Assets	2,625		2,625		2,496
Canada [Member] | Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	1	$ (14)	(4)	$ (34)
Assets	$ 172		$ 172		$ 188