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Revenues - Schedule of Revenues Disaggregated by Lines of Business (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 3,129 | $ 2,743 | $ 9,107 | $ 8,545
Total Merchandise |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,890 | 1,688 | 5,576 | 5,325
Chemicals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 596 | 546 | 1,741 | 1,664
Agricultural and Food Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 325 | 288 | 959 | 941
Automotive |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 300 | 269 | 934 | 892
Forest Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 223 | 181 | 633 | 567
Metals and Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 205 | 178 | 589 | 546
Minerals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 137 | 120 | 388 | 362
Fertilizers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 104 | 106 | 332 | 353
Total Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 588 | 514 | 1,660 | 1,566
Domestic Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 347 | 350 | 937 | 1,029
Export Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 241 | 164 | 723 | 537
Total Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 500 | 446 | 1,439 | 1,328
Domestic Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 331 | 297 | 948 | 896
International Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 169 | 149 | 491 | 432
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 151 | $ 95 | $ 432 | $ 326

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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