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SUPPLEMENTAL CASH FLOW AND OTHER DATA (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow and Other Data | Supplemental cash flow and other data for the years ended December 31, 2020, 2019 and 2018 was as follows:
| 2020 |  | 2019 |  | 2018
Depreciation expense | $ | 258 |  |  | $ | 233 |  |  | $ | 219 |
Amortization expense | 103 |  |  | 96 |  |  | 90 |
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 | $ | — |  |  | $ | — |  |  | $ | 3 |
Dividend payable | $ | 76 |  |  | $ | 71 |  |  | $ | 71 |
Businesses acquired: |  |  |  |  |
Fair value of assets acquired | $ | 368 |  |  | $ | 63 |  |  | $ | 453 |
Fair value of liabilities assumed | 17 |  |  | — |  |  | 7 |
Fair value of net assets acquired | 351 |  |  | 63 |  |  | 446 |
Merger consideration payable | — |  |  | (5) |  |  | (19) |
Cash paid for business acquisitions | 351 |  |  | 58 |  |  | 427 |
Less: Cash acquired | 21 |  |  | — |  |  | 6 |
Business acquisitions, net of cash acquired | $ | 330 |  |  | $ | 58 |  |  | $ | 421 |
|  |  |  | 2020 |  | 2019 |  | 2018
Leases: |  |  |  |  |  |  |  |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |  |
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 (a) |  |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
(a) For the year ended December 31, 2018, leased assets obtained in exchange for new finance lease liabilities reflects information prior to the adoption of the new accounting standard for leases on January 1, 2019. See Note 14 for further discussion of the Company's accounting for leases.

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