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Fair Value Measurements, Derivative Instruments and Hedging Activities - Fuel Derivatives Outstanding (Details)
bbl in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
bbl
$ / bbl
Aug. 31, 2016
USD ($)
Aug. 31, 2017
USD ($)
bbl
$ / bbl
Aug. 31, 2016
USD ($)
Derivative [Line Items]        
Gains (losses) on fuel derivatives, net | $ $ 7 $ (36) $ (19) $ (102)
Fuel        
Derivative [Line Items]        
Unrealized gains on fuel derivatives, net | $ 65 25 134 121
Realized losses on fuel derivatives, net | $ (57) (61) (153) (223)
Gains (losses) on fuel derivatives, net | $ $ 7 $ (36) $ (19) $ (102)
Fuel Derivatives 2017 Maturity February 2013 Transaction        
Derivative [Line Items]        
Barrels (in thousands) | bbl 819   819  
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 (in thousands) | bbl 507   507  
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 2014 Transaction        
Derivative [Line Items]        
Barrels (in thousands) | bbl 450   450  
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 (in thousands) | bbl 255   255  
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 (in thousands) | bbl 2,031   2,031  
Fuel Derivatives 2018 Maturity January 2014 Transaction        
Derivative [Line Items]        
Barrels (in thousands) | 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 (in thousands) | 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 (in thousands) | bbl 5,700   5,700