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SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]      
Depreciation expense $ 219 $ 196 $ 177
Amortization expense 90 74 72
Depreciation and amortization expense 309 270 249
Interest expense (169) (153) (144)
Interest income 2 2 1
Interest expense, net (167) (151) (143)
Interest paid 174 159 148
Income taxes paid 84 243 361
Assets acquired under capital leases 1 7 0
Accounts payable associated with capital expenditures 11 26 9
Accounts payable associated with purchases of treasury stock 3 0 0
Dividend payable 71 61 62
Fair value of assets acquired 453 657 139
Fair value of liabilities assumed 7 58  
Fair value of net assets acquired 446 599 139
Merger consideration paid (payable) (19) (6)  
Cash paid for business acquisitions 427 593 139
Less: cash acquired 6 12  
Business acquisitions, net of cash acquired $ 421 $ 581 $ 139