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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill by segment and changes during the period | Goodwill by segment and changes in goodwill is reflected in the following table (in millions):
| Transportation |  | Facilities |  | Supply and Logistics |  | Total
Balance at December 31, 2016 | $ | 806 |  |  | $ | 1,034 |  |  | $ | 504 |  |  | $ | 2,344 |
Acquisitions | 269 |  |  | — |  |  | — |  |  | 269 |
Foreign currency translation adjustments | 16 |  |  | 7 |  |  | 4 |  |  | 27 |
Divestitures and reclassifications to assets held for sale | (21 | ) |  | (53 | ) |  | — |  |  | (74 | )
Balance at December 31, 2017 | $ | 1,070 |  |  | $ | 988 |  |  | $ | 508 |  |  | $ | 2,566 |
Foreign currency translation adjustments | (19 | ) |  | (8 | ) |  | (5 | ) |  | (32 | )
Divestitures | (11 | ) |  | (2 | ) |  | — |  |  | (13 | )
Balance at December 31, 2018 | $ | 1,040 |  |  | $ | 978 |  |  | $ | 503 |  |  | $ | 2,521 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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