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Acquisitions, Investments in Unconsolidated Entities, Dispositions and Impairments - Impairments (Details) - Depreciation and amortization
$ in Millions
3 Months Ended
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