SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Depreciation expense	$ 55	$ 50	$ 162	$ 143
Amortization expense	22	19	66	54
Depreciation and amortization expense	77	69	228	197
Interest expense	(42)	(39)	(126)	(114)
Interest income	1	1	2	2
Interest expense, net	(41)	(38)	(124)	(112)
Interest paid	28	27	114	104
Income taxes paid	29	64	70	177
Assets acquired under capital leases	0	0	1	0
Accounts payable associated with capital expenditures	13	14	13	14
Accounts payable associated with purchases of treasury stock	0	15	0	15
Dividends payable	68	62	68	62
Fair value of assets acquired	59	229	242	343
Fair value of liabilities assumed	0	40	1	40
Fair value of net assets acquired	59	189	241	303
Merger consideration paid (payable), net	(5)	(2)	(17)	(4)
Cash paid for business acquisitions	54	187	224	299
Less: Cash acquired	0	0	5	0
Business acquisitions, net of cash acquired	$ 54	$ 187	$ 219	$ 299