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Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment |  |  |
Property and equipment, gross | $ 24,290 | $ 22,802 |
Accumulated depreciation and amortization | (13,998) | (12,627) |
Property and equipment, net | 10,292 | 10,175 |
Property and equipment under capital leases | 588 | 547 |
Capital leases, accumulated depreciation | 140 | 119 |
Depreciation expense | 1,700 | 1,700 | $ 1,500
Land |  |  |
Property, Plant and Equipment |  |  |
Property and equipment, gross | 1,707 | 1,734 |
Furniture and Fixtures |  |  |
Property, Plant and Equipment |  |  |
Property and equipment, gross | 11,963 | 10,956 |
Leasehold Improvements |  |  |
Property, Plant and Equipment |  |  |
Property and equipment, gross | 4,793 | 4,494 |
Building and Building Improvements |  |  |
Property, Plant and Equipment |  |  |
Property and equipment, gross | 3,343 | 3,226 |
Software |  |  |
Property, Plant and Equipment |  |  |
Property and equipment, gross | $ 2,484 | $ 2,392 |
Minimum | Building |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 10 years |  |
Minimum | Building Improvements |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 10 years |  |
Minimum | Furniture and Fixtures |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 3 years |  |
Minimum | Leasehold Improvements |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 10 years |  |
Minimum | Equipment |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 3 years |  |
Minimum | Software and Software Development Costs |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 3 years |  |
Maximum | Building |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 40 years |  |
Maximum | Building Improvements |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 40 years |  |
Maximum | Furniture and Fixtures |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 10 years |  |
Maximum | Leasehold Improvements |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 40 years |  |
Maximum | Equipment |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 10 years |  |
Maximum | Software and Software Development Costs |  |  |
Property, Plant and Equipment |  |  |
Estimated useful life (in years) | 10 years |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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