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Fair Value Measurements, Derivative Instruments and Hedging Activities - Fuel Derivatives Outstanding (Details)
bbl in Thousands, $ in Millions
3 Months Ended 6 Months Ended
May 31, 2017
USD ($)
bbl
$ / bbl
May 31, 2016
USD ($)
May 31, 2017
USD ($)
bbl
$ / bbl
May 31, 2016
USD ($)
Derivative [Line Items]        
(Losses) gains on fuel derivatives, net | $ $ (53) $ 171 $ (27) $ (65)
Fuel        
Derivative [Line Items]        
Unrealized (losses) gains on fuel derivatives, net | $ (2) 242 69 96
Realized losses on fuel derivatives, net | $ (51) (71) (96) (161)
(Losses) gains on fuel derivatives, net | $ $ (53) $ 171 $ (27) $ (65)
Fuel Derivatives 2017 Maturity February 2013 Transaction        
Derivative [Line Items]        
Barrels | bbl 1,638   1,638  
Weighted-Average Floor Price (in dollars per barrel) 80   80  
Weighted-Average Ceiling Price (in dollars per barrel) 115   115  
Fuel Derivatives 2017 Maturity April 2013 Transaction        
Derivative [Line Items]        
Barrels | bbl 1,014   1,014  
Weighted-Average Floor Price (in dollars per barrel) 75   75  
Weighted-Average Ceiling Price (in dollars per barrel) 110   110  
Fuel Derivatives 2017 Maturity Date January Twenty Fourteen Transaction [Member]        
Derivative [Line Items]        
Barrels | bbl 900   900  
Weighted-Average Floor Price (in dollars per barrel) 75   75  
Weighted-Average Ceiling Price (in dollars per barrel) 114   114  
Fuel Derivatives 2017 Maturity October 2014 Transaction        
Derivative [Line Items]        
Barrels | bbl 510   510  
Weighted-Average Floor Price (in dollars per barrel) 80   80  
Weighted-Average Ceiling Price (in dollars per barrel) 113   113  
Fuel Derivatives 2017 Maturity        
Derivative [Line Items]        
Barrels | bbl 4,062   4,062  
Fuel Derivatives 2018 Maturity January 2014 Transaction        
Derivative [Line Items]        
Barrels | bbl 2,700   2,700  
Weighted-Average Floor Price (in dollars per barrel) 75   75  
Weighted-Average Ceiling Price (in dollars per barrel) 110   110  
Fuel Derivatives 2018 Maturity October 2014 Transaction        
Derivative [Line Items]        
Barrels | bbl 3,000   3,000  
Weighted-Average Floor Price (in dollars per barrel) 80   80  
Weighted-Average Ceiling Price (in dollars per barrel) 114   114  
Fuel Derivatives 2018 Maturity        
Derivative [Line Items]        
Barrels | bbl 5,700   5,700