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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | 4. Property and Equipment Property and equipment as of December 31 consisted of the following (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Land | ​ | $ | 732 | ​ | $ | 740
Landfills | ​ |  | 17,734 | ​ |  | 16,842
Vehicles (a) | ​ |  | 5,893 | ​ |  | 5,800
Machinery and equipment (a) | ​ |  | 3,571 | ​ |  | 3,217
Containers (a) | ​ |  | 2,807 | ​ |  | 2,694
Buildings and improvements (a) | ​ |  | 3,542 | ​ |  | 3,463
Furniture, fixtures and office equipment (a) | ​ |  | 677 | ​ | ​ | 729
​ | ​ |  | 34,956 | ​ |  | 33,485
Less: Accumulated depreciation of tangible property and equipment (a) | ​ |  | (10,147) | ​ |  | (9,645)
Less: Accumulated amortization of landfill airspace | ​ |  | (10,390) | ​ | ​ | (9,692)
Property and equipment, net | ​ | $ | 14,419 | ​ | $ | 14,148
(a) | In our Annual Report on Form 10-K for the year ended December 31, 2020, our accumulated depreciation and gross property and equipment balances as of December 31, 2020 were overstated. We subsequently corrected the balances in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 and have provided the corrected balances in all filings thereafter, as discussed in Note 1.
Depreciation and amortization expense, including amortization expense for assets recorded as financing leases, consisted of the following for the year ended December 31 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Depreciation of tangible property and equipment | ​ | $ | 1,125 | ​ | $ | 996 | ​ | $ | 893
Amortization of landfill airspace | ​ |  | 731 | ​ | ​ | 568 | ​ | ​ | 575
Depreciation and amortization expense | ​ | $ | 1,856 | ​ | $ | 1,564 | ​ | $ | 1,468
​ See Note 5 for information regarding amortization of our intangible assets.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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