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Property | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment, Net [Abstract] |
Property | Property
| Estimated Useful Lives in Years |  | December 31, 2017 |  | December 31, 2016
Land |  |  | $ | 1,647 |  |  | $ | 1,587 |
Buildings and improvements | 5-40 |  | 7,471 |  |  | 6,217 |
Machinery and equipment | 3-27 |  | 23,915 |  |  | 21,613 |
Special tools | 1-13 |  | 21,113 |  |  | 19,359 |
Construction in progress |  |  | 6,188 |  |  | 4,493 |
Total property |  |  | 60,334 |  |  | 53,269 |
Less: accumulated depreciation |  |  | (24,081 | ) |  | (20,666 | )
Total property, net |  |  | $ | 36,253 |  |  | $ | 32,603 |
The amount of capitalized software included in Property, net was $1.2 billion and $1.1 billion at December 31, 2017 and 2016. The amount of interest capitalized and excluded from Automotive interest expense related to Property, net was insignificant in the years ended December 31, 2017, 2016 and 2015.
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Depreciation and amortization expense | $ | 4,966 |  |  | $ | 4,622 |  |  | $ | 3,904 |
Impairment charges | $ | 199 |  |  | $ | 68 |  |  | $ | 628 |
Capitalized software amortization expense(a) | $ | 459 |  |  | $ | 458 |  |  | $ | 374 |
__________
(a) | Included in depreciation and amortization expense.

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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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- References No definition available. + Details
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