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Land, Buildings, Equipment and Software, Net - Depreciation Expense, Operating Lease Rent Expense, Minimum Operating Lease Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Land, Buildings, Equipment and Software, Net [Abstract] |  |  |
Depreciation expense | $ 121 | $ 125 | $ 130
Operating lease rent expense | 208 | 267 | 299
Capital Leased Property Plant and Equipment Net Book Value |  | 24 | 32
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Operating Leases, Future Minimum Payments Receivable, Current | 153 |  |
Operating Leases, Future Minimum Payments Receivable, in Two Years | 113 |  |
Operating Leases, Future Minimum Payments Receivable, in Three Years | 78 |  |
Operating Leases, Future Minimum Payments Receivable, in Four Years | 53 |  |
Operating Leases, Future Minimum Payments Receivable, in Five Years | 33 |  |
Operating Leases, Future Minimum Payments Receivable, Thereafter | 76 |  |
Capitalized Computer Software, Additions | 47 | 36 | 39
capitalized product software | $ 8 | $ 10 | $ 10

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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