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Revenues - Revenues Disaggregated by Lines of Business (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 3,013 | $ 2,876
Total Merchandise |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,879 | 1,779
Chemicals |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 586 | 557
Agricultural and Food Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 344 | 307
Automotive |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 311 | 304
Forest Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 216 | 195
Metals and Equipment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 189 | 186
Minerals |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 123 | 114
Fertilizers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 110 | 116
Coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 538 | 503
Intermodal |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 428 | 449
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 168 | $ 145

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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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