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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Changes in goodwill |  |
Balance at beginning of period | $ 2,566 | $ 2,344
Acquisitions |  | 269
Foreign currency translation adjustments | (32) | 27
Divestitures and reclassifications to assets held for sale | (13) | (74)
Balance at end of period | 2,521 | 2,566
Operating Segments | Transportation |  |
Changes in goodwill |  |
Balance at beginning of period | 1,070 | 806
Acquisitions |  | 269
Foreign currency translation adjustments | (19) | 16
Divestitures and reclassifications to assets held for sale | (11) | (21)
Balance at end of period | 1,040 | 1,070
Operating Segments | Facilities |  |
Changes in goodwill |  |
Balance at beginning of period | 988 | 1,034
Foreign currency translation adjustments | (8) | 7
Divestitures and reclassifications to assets held for sale | (2) | (53)
Balance at end of period | 978 | 988
Operating Segments | Supply and Logistics |  |
Changes in goodwill |  |
Balance at beginning of period | 508 | 504
Acquisitions |  | 0
Foreign currency translation adjustments | (5) | 4
Balance at end of period | $ 503 | $ 508

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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