SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Depreciation expense	$ 59	$ 55	$ 175	$ 162
Amortization expense	23	22	72	66
Depreciation and amortization expense	82	77	247	228
Interest expense	(45)	(42)	(136)	(126)
Interest income	1	1	3	2
Interest expense, net	(44)	(41)	(133)	(124)
Interest paid	58	28	149	114
Income taxes paid	65	29	148	70
Accounts payable associated with capital expenditures	24	13	24	13
Dividends payable	72	68	72	68
Fair value of assets acquired	0	59	61	242
Fair value of liabilities assumed	0	0	0	1
Fair value of net assets acquired	0	59	61	241
Merger consideration paid (payable), net	0	(5)	(5)	(17)
Cash paid for business acquisitions	0	54	56	224
Less: Cash acquired	0	0	0	5
Business acquisitions, net of cash acquired	0	54	56	219
Leases:
Operating cash flows from operating leases	45		135
Operating cash flows from finance leases	0		2
Financing cash flows from finance leases	1		3
Leased assets obtained in exchange for new operating lease liabilities	38		116
Leased assets obtained in exchange for new finance lease liabilities (a)	$ 1		$ 1
Leased assets obtained in exchange for new finance lease liabilities		$ 0		$ 1