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SUPPLEMENTAL CASH FLOW AND OTHER DATA
 12 Months Ended
Dec. 31, 2023
Supplemental Cash Flow Elements [Abstract]  
SUPPLEMENTAL CASH FLOW AND OTHER DATA SUPPLEMENTAL CASH FLOW AND OTHER DATA
    Supplemental cash flow and other data for the years ended December 31, 2023, 2022 and 2021 was as follows:
    
202320222021
Depreciation expense$331 $317 $305 
Amortization expense108 120 103 
Depreciation and amortization expense$439 $437 $408 
Interest expense$(163)$(148)$(152)
Interest income11 10 1 
Interest expense, net$(152)$(138)$(151)
Interest paid$134 $156 $159 
Income taxes paid$317 $283 $709 
Accounts payable associated with capital expenditures$42 $38 $26 
Accounts payable associated with purchases of treasury stock$1 $— $23 
Dividend payable$79 $74 $74 
Dividends received from equity method investees$26 $61 $60 
Businesses acquired:  
Fair value of assets acquired$734 $182 $364 
Fair value of liabilities assumed34 16 18 
Fair value of net assets acquired700 166 346 
Merger consideration payable(88)(18)(15)
Cash paid for business acquisitions612 148 331 
Less: Cash acquired1 4 — 
Business acquisitions, net of cash acquired$611 $144 $331 

202320222021
Leases:
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$192 $185 $185 
Operating cash flows from finance leases$— $1 $2 
Financing cash flows from finance leases$1 $1 $2 
Leased assets obtained in exchange for new operating lease liabilities$181 $154 $150 

    During the years ended December 31, 2023, 2022 and 2021, costs associated with donations, contributions, and other financial support through Quest for Health Equity, the Company's initiative with the Quest Diagnostics Foundation to reduce health disparities in underserved communities, were $— million, $93 million and $16 million, respectively. Such amounts are included in selling, general and administrative expenses in the Company's consolidated statement of operations. Costs incurred during the year ended December 31, 2022 will be donated and contributed over several years.