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		3 Months Ended
	May 31, 2012 Fuel Derivatives 2013 Maturity		May 31, 2012 Fuel Derivatives 2014 Maturity		May 31, 2012 Fuel Derivatives 2015 Maturity		May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Net investment hedges	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Net investment hedges	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Fair Value Hedging Interest rate swaps	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Fair Value Hedging Interest rate swaps	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Cash Flow Hedging Interest rate swaps	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Cash Flow Hedging Interest rate swaps	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Maximum Fair Value Hedging Interest rate swaps	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Maximum Cash Flow Hedging Interest rate swaps	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Fuel Derivatives Second Half 2012	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Fuel Derivatives 2013 Maturity	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Fuel Derivatives 2014 Maturity	Nov. 30, 2011 Financial Instruments Measured at Fair Value on a Recurring Basis Fuel Derivatives 2015 Maturity	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Maturing in One Year or Less Net investment hedges	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Maturing in One Year or Less Maximum Net investment hedges	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Maturing in July Twenty Seventeen Net investment hedges	May 31, 2012 Financial Instruments Measured at Fair Value on a Recurring Basis Maturing in July Twenty Seventeen Maximum Net investment hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated percent of fuel consumption	38.00%	[1]	19.00%	[1]	19.00%	[1]									10.00%	10.00%	10.00%	10.00%
Total foreign currency forwards designated as hedges of net investments in foreign operations for euro-denominated functional currency							$ 668	$ 183											$ 512		$ 156
Maturity of foreign currency derivatives																				2012-06		2017-07
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									313	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											$ 273	$ 320

[1] Fuel derivatives mature evenly over each month within the above fiscal periods.