Estimated Fair Value and Basis of Valuation of Financial Instrument Assets And (Liabilities) Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified																				3 Months Ended			3 Months Ended
	Feb. 29, 2012 Net investment hedges Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Net investment hedges Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Net investment hedges Financial Instruments Measured at Fair Value on a Recurring Basis Maximum	Feb. 29, 2012 Fuel Derivatives Second Half 2012 Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Fuel Derivatives Second Half 2012 Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Fuel Derivatives 2013 Maturity		Feb. 29, 2012 Fuel Derivatives 2013 Maturity Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Fuel Derivatives 2013 Maturity Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Fuel Derivatives 2014 Maturity		Feb. 29, 2012 Fuel Derivatives 2014 Maturity Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Fuel Derivatives 2014 Maturity Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Fuel Derivatives 2015 Maturity		Feb. 29, 2012 Fuel Derivatives 2015 Maturity Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Fuel Derivatives 2015 Maturity Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Fair Value Hedging Interest rate swaps Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Fair Value Hedging Interest rate swaps Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Fair Value Hedging Interest rate swaps Financial Instruments Measured at Fair Value on a Recurring Basis Maximum	Feb. 29, 2012 Cash Flow Hedging Interest rate swaps Financial Instruments Measured at Fair Value on a Recurring Basis	Nov. 30, 2011 Cash Flow Hedging Interest rate swaps Financial Instruments Measured at Fair Value on a Recurring Basis	Feb. 29, 2012 Cash Flow Hedging Interest rate swaps Financial Instruments Measured at Fair Value on a Recurring Basis Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated percent of fuel consumption				20.00%	10.00%	20.00%	[1]	20.00%	10.00%	20.00%	[1]	20.00%	10.00%	20.00%	[1]	20.00%	10.00%
Total foreign currency forwards designated as hedges of net investments in foreign operations for euro-denominated functional currency	$ 433	$ 183
Maturity of foreign currency derivatives			July 2017
Amount of interest rate swap agreements change, of fixed rate debt to U.S. dollar LIBOR or GBP LIBOR-based floating rate debt, for both U.S. dollar and sterling interest rate swaps designated as fair value hedges																		316	510
Maturity of interest rate swaps																				2012-06			2022-02
Amount of interest rate swap agreements change, of EURIBOR-based floating rate debt to fixed rate debt, for euro interest rate swaps designated as cash flow hedges																					$ 322	$ 320

[1] Fuel derivatives mature evenly over each quarter within the above fiscal years.