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Revenues - Schedule of Revenues Disaggregated by Lines of Business (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 3,102 | $ 2,933 | $ 5,978 | $ 5,802
Total Merchandise |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,907 | 1,798 | 3,686 | 3,637
Chemicals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 588 | 552 | 1,145 | 1,118
Automotive |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 330 | 307 | 634 | 623
Agricultural and Food Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 327 | 321 | 634 | 653
Forest Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 215 | 194 | 410 | 386
Metals and Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 198 | 178 | 384 | 368
Minerals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 137 | 128 | 251 | 242
Fertilizers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 112 | 118 | 228 | 247
Total Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 569 | 530 | 1,072 | 1,052
Domestic Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 317 | 350 | 590 | 680
Export Coal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 252 | 180 | 482 | 372
Total Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 490 | 448 | 939 | 882
Domestic Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 323 | 308 | 617 | 599
International Intermodal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 167 | 140 | 322 | 283
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 136 | $ 157 | $ 281 | $ 231

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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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