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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2018 | $ | 1,040 |  |  | $ | 978 |  |  | $ | 503 |  |  | $ | 2,521 |
Foreign currency translation adjustments | 12 |  |  | 4 |  |  | 3 |  |  | 19 |
Balance at December 31, 2019 | $ | 1,052 |  |  | $ | 982 |  |  | $ | 506 |  |  | $ | 2,540 |
Acquisitions | 2 |  |  | — |  |  | — |  |  | 2 |
Goodwill, gross | 1,054 |  |  | 982 |  |  | 506 |  |  | 2,542 |
Impairments | (1,038) |  |  | (975) |  |  | (502) |  |  | (2,515) |
Foreign currency translation adjustments | (16) |  |  | (7) |  |  | (4) |  |  | (27) |
Accumulated impairment losses | (1,054) |  |  | (982) |  |  | (506) |  |  | (2,542) |
Balance at December 31, 2020 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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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=121556970&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=121556970&loc=d3e13854-109267 + Details
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