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Acquisitions, Dispositions and Impairments - Impairments (Details) - Depreciation and amortization $ in Millions | 3 Months Ended
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Jun. 30, 2016 USD ($)
Impairments |
Charge related to write-off of remaining book value of assets taken out of service | $ 18
Rail and other terminal assets | Facilities |
Impairments |
Non-cash impairment losses on long-lived assets | $ 80

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