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Property and Equipment | 12 Months Ended
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Jan. 30, 2016
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment is depreciated using the straight-line method over estimated useful lives or lease terms if shorter. We amortize leasehold improvements purchased after the beginning of the initial lease term over the shorter of the assets' useful lives or a term that includes the original lease term, plus any renewals that are reasonably assured at the date the leasehold improvements are acquired. Depreciation and capital lease amortization expense for 2015, 2014, and 2013 was $2,191 million, $2,108 million, and $1,975 million, respectively. For income tax purposes, accelerated depreciation methods are generally used. Repair and maintenance costs are expensed as incurred. Facility pre-opening costs, including supplies and payroll, are expensed as incurred.
Estimated Useful Lives | Life (Years)
Buildings and improvements | 8-39
Fixtures and equipment | 2-15
Computer hardware and software | 2-7
Long-lived assets are reviewed for impairment when events or changes in circumstances, such as a decision to relocate or close a store or make significant software changes, indicate that the asset's carrying value may not be recoverable. For asset groups classified as held for sale, the carrying value is compared to the fair value less cost to sell. We estimate fair value by obtaining market appraisals, valuations from third party brokers, or other valuation techniques.
Impairments (a) (millions) | 2015 |  | 2014 |  | 2013 |
Impairments included in segment SG&A | $ | 50 |  | $ | 108 |  | $ | 58 |
Unallocated impairments (b) | 4 |  | 16 |  | 19 |
Total impairments | $ | 54 |  | $ | 124 |  | $ | 77 |
(a) | Substantially all of the impairments are recorded in SG&A expense on the Consolidated Statements of Operations, primarily from completed or planned store closures and software changes.
(b) | For 2015, represents long-lived asset impairments from our decision to wind down certain noncore operations. For 2014 and 2013, represents impairments of undeveloped land.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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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