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Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 Capital Leases | 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

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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