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Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | $ 26,869 | $ 24,290
Accumulated depreciation and amortization | (15,520) | (13,998)
Property, Plant and Equipment, Net | 11,349 | 10,292
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract] |  |
Property and equipment under capital leases | 582 | 588
Accumulated amortization of property and equipment under capital leases | (163) | (140)
Property and equipment under capital leases, net | 419 | 448
Land |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | 1,872 | 1,707
Building and improvements |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | 3,785 | 3,343
Fixtures and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | 13,028 | 11,963
Leashold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | 5,384 | 4,793
Software |  |
Property, Plant and Equipment [Line Items] |  |
Total property and equipment | $ 2,800 | $ 2,484

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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=84164758&loc=d3e45014-112735 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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