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Commitments and Contingencies (Insurance and Legal) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Dec. 27, 2013
Dec. 27, 2013
Pending Litigation [Member]
May 31, 2007
Fuel Surcharge Antitrust Litigation [Member]
entity
Insurance      
Non-catastrophic property deductible $ 25    
Casualty and catastrophic property deductible 50    
Loss Contingency, Estimate [Abstract]      
Minimum range of possible loss for legal proceedings   2  
Maximum range of possible loss for legal proceedings   $ 15  
Number of other U.S.-based entities mentioned in class action lawsuit     3