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SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]        
Depreciation expense $ 56 $ 55 $ 116 $ 107
Amortization expense 25 22 49 44
Depreciation and amortization expense 81 77 165 151
Interest expense (46) (43) (91) (84)
Interest income 1 1 2 1
Interest expense, net (45) (42) (89) (83)
Interest paid 63 37 91 86
Income taxes paid 80 39 83 41
Assets acquired under capital leases 0 1 0 1
Accounts payable associated with capital expenditures 15 13 15 13
Dividends payable 72 69 72 69
Fair value of assets acquired 0 35 61 183
Fair value of liabilities assumed 0 0 0 (1)
Fair value of net assets acquired 0 35 61 182
Merger consideration paid (payable), net 0 0 (5) (12)
Cash paid for business acquisitions 0 35 56 170
Less: Cash acquired 0 0 0 5
Business acquisitions, net of cash acquired 0 $ 35 56 $ 165
Leases:        
Operating cash flows from operating leases 45   90  
Operating cash flows from finance leases 1   2  
Financing cash flows from finance leases 1   2  
Leased assets obtained in exchange for new operating lease liabilities $ 53   $ 78