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Property and Equipment | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Property and Equipment | 5. Property and Equipment Property and equipment as of December 31 consisted of the following (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Land | ​ | $ | 656 | ​ | $ | 656
Landfills | ​ |  | 15,910 | ​ |  | 15,240
Vehicles | ​ |  | 5,344 | ​ |  | 5,059
Machinery and equipment | ​ |  | 3,140 | ​ |  | 2,988
Containers | ​ |  | 2,616 | ​ |  | 2,588
Buildings and improvements | ​ |  | 3,174 | ​ |  | 2,998
Furniture, fixtures and office equipment | ​ |  | 710 | ​ | ​ | 677
​ | ​ |  | 31,550 | ​ |  | 30,206
Less: Accumulated depreciation of tangible property and equipment | ​ |  | (9,331) | ​ |  | (9,107)
Less: Accumulated amortization of landfill airspace | ​ |  | (9,326) | ​ | ​ | (9,157)
Property and equipment, net | ​ | $ | 12,893 | ​ | $ | 11,942
​ Depreciation and amortization expense, including amortization expense for assets recorded as financing leases, consisted of the following for the years ended December 31 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Depreciation of tangible property and equipment | ​ | $ | 893 | ​ | $ | 838 | ​ | $ | 783
Amortization of landfill airspace | ​ |  | 575 | ​ | ​ | 538 | ​ | ​ | 497
Depreciation and amortization expense | ​ | $ | 1,468 | ​ | $ | 1,376 | ​ | $ | 1,280
​

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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