Fair Value Measurements, Derivative Instruments and Hedging Activities - Derivatives Qualifying and Designated as Hedging Instruments Recognized in Other Comprehensive Income (Detail)	3 Months Ended		9 Months Ended
	Aug. 31, 2015 USD ($) counterparty	Aug. 31, 2014 USD ($)	Aug. 31, 2015 USD ($) counterparty	Aug. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Fuel Derivative, Counterparty | counterparty	1		1
Fuel
Derivative Instruments, Gain (Loss) [Line Items]
Collateral posted	$ 22,000,000		$ 22,000,000
Collateral required to be received	0		0
Collateral required to be posted						$ 0
Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, cash collateral netting threshold, fair value	100,000,000		100,000,000
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	(13,000,000)	$ 3,000,000	33,000,000	$ 3,000,000
Designated as hedging instruments | Foreign currency zero cost collars
Derivative Instruments, Gain (Loss) [Line Items]
Effective portions of derivatives qualifying and designated as hedging instruments recognized in other comprehensive income	9,000,000	(5,000,000)	(39,000,000)	(11,000,000)
Designated as hedging instruments | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Effective portions of derivatives qualifying and designated as hedging instruments recognized in other comprehensive income	$ 5,000,000	$ (11,000,000)	$ 8,000,000	$ (26,000,000)
Subsequent Event | Fuel
Derivative Instruments, Gain (Loss) [Line Items]
Collateral posted					$ 9,000,000