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v3.3.1.900

Commitments and Contingencies (Purchase Commitments) (Details) $ in Millions | 12 Months Ended
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Dec. 25, 2015 USD ($) locomotives | Dec. 26, 2014 USD ($) locomotives | Dec. 27, 2013 USD ($) locomotives
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Percentage of locomotive fleet under long-term maintenance program | 50.00% |  |
Amounts Paid | $ 233 | $ 247 | $ 287
Number of Locomotives | locomotives | 2,310 | 1,886 | 1,886
Unrecorded Unconditional Purchase Obligation [Abstract] |  |  |
2016 | $ 680 |  |
2017 | 635 |  |
2018 | 307 |  |
2019 | 323 |  |
2020 | 328 |  |
Thereafter | 4,579 |  |
Total | 6,852 |  |
Locomotive & Maintenance Payments [Member] |  |  |
Unrecorded Unconditional Purchase Obligation [Abstract] |  |  |
2016 | 570 |  |
2017 | 561 |  |
2018 | 287 |  |
2019 | 306 |  |
2020 | 316 |  |
Thereafter | 4,515 |  |
Total | 6,555 |  |
Other Commitments [Member] |  |  |
Unrecorded Unconditional Purchase Obligation [Abstract] |  |  |
2016 | 110 |  |
2017 | 74 |  |
2018 | 20 |  |
2019 | 17 |  |
2020 | 12 |  |
Thereafter | 64 |  |
Total | $ 297 |  |

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- Definition Maintenance costs incurred and directly related to services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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