Fair Value Measurements, Derivative Instruments and Hedging Activities and Financial Risks - Derivatives Qualifying and Designated as Hedging Instruments Recognized in Other Comprehensive Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Nov. 30, 2017
Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, cash collateral netting threshold, fair value	$ 100,000,000		$ 100,000,000
Fuel
Derivative Instruments, Gain (Loss) [Line Items]
Collateral required to be posted	0		0		$ 0
Collateral required to be received	0		0		$ 0
Designated as hedging instruments | Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Effective portions of derivatives qualifying and designated as hedging instruments recognized in other comprehensive income	3,000,000	$ (17,000,000)	13,000,000	$ (33,000,000)
Designated as hedging instruments | Foreign currency zero cost collars – cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Effective portions of derivatives qualifying and designated as hedging instruments recognized in other comprehensive income	(1,000,000)	17,000,000	(11,000,000)	52,000,000
Designated as hedging instruments | Interest rate swaps – cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Effective portions of derivatives qualifying and designated as hedging instruments recognized in other comprehensive income	$ 1,000,000	$ 1,000,000	$ 5,000,000	$ 5,000,000