SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Depreciation expense	$ 196	$ 177	$ 223
Amortization expense	74	72	81
Depreciation and amortization expense	270	249	304
Interest expense	(153)	(144)	(154)
Interest income	2	1	1
Interest expense, net	(151)	(143)	(153)
Interest paid	159	148	172
Income taxes paid	243	361	319
Assets acquired under capital leases	7	0	3
Accounts payable associated with capital expenditures	26	9	15
Dividend payable	61	62	55
Fair value of assets acquired	657	139	63
Fair value of liabilities assumed	58	0
Fair value of net assets acquired	599	139	63
Merger consideration paid (payable)	(6)	0	4
Cash paid for business acquisitions	593	139	67
Less: cash acquired	12	0
Business acquisitions, net of cash acquired	$ 581	$ 139	$ 67