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Fair Value Measurements, Derivative Instruments and Hedging Activities and Financial Risks - Fuel Derivatives Outstanding (Details)
bbl in Thousands, $ in Millions
3 Months Ended
Feb. 28, 2018
USD ($)
$ / bbl
bbl
Feb. 28, 2017
USD ($)
Derivative [Line Items]    
Gains on fuel derivatives, net | $ $ 16 $ 27
Fuel    
Derivative [Line Items]    
Unrealized gains on fuel derivatives, net | $ 32 72
Realized losses on fuel derivatives, net | $ (16) (45)
Gains on fuel derivatives, net | $ $ 16 $ 27
Fuel Derivatives 2018 Maturity January 2014 Transaction    
Derivative [Line Items]    
Barrels (in thousands) | bbl 2,025  
Weighted-average floor price (in dollars per barrel) | $ / bbl 75  
Weighted-average ceiling price (in dollars per barrel) | $ / bbl 110  
Fuel Derivatives 2018 Maturity October 2014 Transaction    
Derivative [Line Items]    
Barrels (in thousands) | bbl 2,250  
Weighted-average floor price (in dollars per barrel) | $ / bbl 80  
Weighted-average ceiling price (in dollars per barrel) | $ / bbl 114  
Fuel Derivatives 2018 Maturity    
Derivative [Line Items]    
Barrels (in thousands) | bbl 4,275