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Property and Equipment, net | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property and Equipment, net |
10. | Property and Equipment, net
Property and equipment, net consisted of:
| As of December 31,
| 2017 |  | 2016
Land | $ | 49 |  |  | $ | 47 |
Buildings and leasehold improvements | 626 |  |  | 597 |
Capitalized software | 583 |  |  | 524 |
Furniture, fixtures and equipment | 387 |  |  | 354 |
Projects in process | 118 |  |  | 99 |
Buses and support vehicles | 93 |  |  | 91 |
| 1,856 |  |  | 1,712 |
Less: Accumulated depreciation and amortization | (1,152 | ) |  | (1,027 | )
Property and equipment, net | $ | 704 |  |  | $ | 685 |
Depreciation and amortization expense relating to property and equipment during 2017, 2016 and 2015 was $197 million, $188 million and $159 million, respectively (including $95 million, $87 million and $61 million, respectively, of amortization expense relating to capitalized software).

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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