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SUPPLEMENTAL CASH FLOW AND OTHER DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental Cash Flow and Other Data [Line Items]                      
Amortization expense $ 26 $ 27 $ 25 $ 25 $ 24 $ 23 $ 25 $ 24 $ 103 $ 96 $ 90
Depreciation expense                 258 233 219
Depreciation and amortization expense                 361 329 309
Interest expense                 (166) (180) (169)
Interest income                 3 5 2
Interest expense, net                 (163) (175) (167)
Interest paid                 201 192 174
Income taxes paid                 360 202 84
Accounts payable associated with capital expenditures                 46 26 11
Accounts payable associated with purchases of treasury stock 0       0       0 0 3
Dividend payable 76       71       76 71 71
Fair value of assets acquired                 368 63 453
Fair value of liabilities assumed                 17 0 7
Fair value of net assets acquired                 351 63 446
Merger consideration payable                 0 (5) (19)
Cash paid for business acquisitions                 351 58 427
Less: cash acquired                 21 0 6
Business acquisitions, net of cash acquired                 330 58 421
Leases:                      
Operating cash flows from operating leases                 185 180  
Operating cash flows from finance leases                 3 3  
Financing cash flows from finance leases                 3 4  
Leased assets obtained in exchange for new operating lease liabilities                 219 164  
Leased assets obtained in exchange for new finance lease liabilities                 $ 0 $ 1  
Leased assets obtained in exchange for new finance lease liabilities                     $ 1
Intangible Assets                      
Supplemental Cash Flow and Other Data [Line Items]                      
Amortization expense $ 28 $ 30 $ 28 $ 28 $ 27 $ 25 $ 30 $ 29