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SUPPLEMENTAL CASH FLOW & OTHER DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]        
Depreciation expense $ 55 $ 48 $ 107 $ 93
Amortization expense 22 18 44 35
Depreciation and amortization expense 77 66 151 128
Interest expense (43) (38) (84) (75)
Interest income 1 0 1 1
Interest expense, net (42) (38) (83) (74)
Interest paid 37 31 86 77
Income taxes paid 39 105 41 113
Assets acquired under capital leases 1 0 1 0
Accounts payable associated with capital expenditures 13 13 13 13
Dividends payable 69 62 69 62
Fair value of assets acquired 35 113 183 114
Fair value of liabilities assumed 0 0 (1) 0
Fair value of net assets acquired 35 113 182 114
Merger consideration paid (payable), net 0 (2) (12) (2)
Cash paid for business acquisitions 35 111 170 112
Less: Cash acquired 0 0 5 0
Business acquisitions, net of cash acquired $ 35 $ 111 $ 165 $ 112