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Commitments and Contingencies (Details) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 mi | May 31, 2007 entity | Sep. 30, 2017 USD ($) claim mi | Aug. 09, 2017 | Dec. 30, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Locomotive fleet covered by maintenance program (as a percent) |  |  |  | 34.00% | 50.00%
Estimated obligation under maintenance program |  |  | $ 1,700,000,000 |  | $ 5,000,000,000
Casualty and non catastrophic property deductible |  |  | 25,000,000 |  |
Casualty and catastrophic property deductible |  |  | $ 50,000,000 |  |
Environmental |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | mi |  |  | 17 |  |
Pending Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Claims with potential material impact (number of claims) | claim |  |  | 1 |  |
Pending Litigation | Fuel Surcharge Antitrust Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Class action lawsuits filed against U.S.-based Class I railroads, excluding CSXT (number of entities) | entity |  | 3 |  |  |
Pending Litigation | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Possible loss for certain legal proceedings |  |  | $ 2,000,000 |  |
Pending Litigation | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Possible loss for certain legal proceedings |  |  | $ 116,000,000 |  |
Settled Litigation | Environmental |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of miles subject to remediation | mi | 8 |  |  |  |
Years required for site cleanup | 10 years |  |  |  |

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