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Leases - Additional Information (Details) $ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 Center | Dec. 31, 2015 USD ($)
Leases |  |
Capital lease obligations | $ |  | $ 0.3
Retail and mail order locations, distribution centers and corporate offices |  |
Leases |  |
Number of distribution centers leased | Center | 13 |
Retail and mail order locations, distribution centers and corporate offices | Minimum |  |
Leases |  |
Non-cancelable operating leases, initial term (in years) | 15 years |
Retail and mail order locations, distribution centers and corporate offices | Maximum |  |
Leases |  |
Non-cancelable operating leases, initial term (in years) | 25 years |
Equipment and other assets | Minimum |  |
Leases |  |
Non-cancelable operating leases, initial term (in years) | 3 years |
Equipment and other assets | Maximum |  |
Leases |  |
Non-cancelable operating leases, initial term (in years) | 10 years |

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- Definition Represents the number of distribution centers leased under non-cancelable operating leases. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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