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SEGMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Operating Revenue by Principle Geographic Region | The Company’s operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) for the years ended December 31 is presented in the table below (in millions):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Domestic (U.S. and Canada) |  | $ | 23,131 |  |  | $ | 22,202 |  |  | $ | 21,931 |
Pacific |  |  | 4,898 |  |  |  | 4,959 |  |  |  | 5,498 |
Atlantic |  |  | 6,285 |  |  |  | 6,157 |  |  |  | 7,068 |
Latin America |  |  | 3,422 |  |  |  | 3,238 |  |  |  | 3,367 |
Total |  | $ | 37,736 |  |  | $ | 36,556 |  |  | $ | 37,864 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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