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Fair Value Measurements, Derivative Instruments and Hedging Activities - Fuel Derivatives Outstanding (Detail) bbl in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2015 USD ($) bbl $ / bbl | Aug. 31, 2014 USD ($) | Aug. 31, 2015 USD ($) bbl $ / bbl | Aug. 31, 2014 USD ($)
Derivative [Line Items] |  |  |  |
(Losses) gains on fuel derivatives, net | $ | $ (197) | $ 15 | $ (378) | $ 10
Fuel Derivatives 2015 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 2,601 |  | 2,601 |
Percent of Estimated Fuel Consumption | 50.00% |  | 50.00% |
Fuel Derivatives 2015 Maturity November 2011 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 540 |  | 540 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 114 |  | 114 |
Fuel Derivatives 2015 Maturity February 2012 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 540 |  | 540 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 125 |  | 125 |
Fuel Derivatives 2015 Maturity June 2012 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 309 |  | 309 |
Weighted-Average Floor Price (in dollars per barrel) | 74 |  | 74 |
Weighted-Average Ceiling Price (in dollars per barrel) | 110 |  | 110 |
Fuel Derivatives 2015 Maturity April 2013 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 261 |  | 261 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 111 |  | 111 |
Fuel Derivatives 2015 Maturity May 2013 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 471 |  | 471 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 110 |  | 110 |
Fuel Derivatives 2015 Maturity October 2014 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 480 |  | 480 |
Weighted-Average Floor Price (in dollars per barrel) | 79 |  | 79 |
Weighted-Average Ceiling Price (in dollars per barrel) | 110 |  | 110 |
Fuel Derivatives 2016 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 8,724 |  | 8,724 |
Percent of Estimated Fuel Consumption | 53.00% |  | 53.00% |
Fuel Derivatives 2016 Maturity June 2012 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 3,564 |  | 3,564 |
Weighted-Average Floor Price (in dollars per barrel) | 75 |  | 75 |
Weighted-Average Ceiling Price (in dollars per barrel) | 108 |  | 108 |
Fuel Derivatives 2016 Maturity February 2013 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 2,160 |  | 2,160 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 120 |  | 120 |
Fuel Derivatives 2016 Maturity April 2013 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 3,000 |  | 3,000 |
Weighted-Average Floor Price (in dollars per barrel) | 75 |  | 75 |
Weighted-Average Ceiling Price (in dollars per barrel) | 115 |  | 115 |
Fuel Derivatives 2017 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 8,124 |  | 8,124 |
Percent of Estimated Fuel Consumption | 49.00% |  | 49.00% |
Fuel Derivatives 2017 Maturity February 2013 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 3,276 |  | 3,276 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 115 |  | 115 |
Fuel Derivatives 2017 Maturity April 2013 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 2,028 |  | 2,028 |
Weighted-Average Floor Price (in dollars per barrel) | 75 |  | 75 |
Weighted-Average Ceiling Price (in dollars per barrel) | 110 |  | 110 |
Fuel Derivatives 2017 Maturity January 2014 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 1,800 |  | 1,800 |
Weighted-Average Floor Price (in dollars per barrel) | 75 |  | 75 |
Weighted-Average Ceiling Price (in dollars per barrel) | 114 |  | 114 |
Fuel Derivatives 2017 Maturity October 2014 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 1,020 |  | 1,020 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 113 |  | 113 |
Fuel Derivatives 2018 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 5,700 |  | 5,700 |
Percent of Estimated Fuel Consumption | 34.00% |  | 34.00% |
Fuel Derivatives 2018 Maturity January 2014 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 2,700 |  | 2,700 |
Weighted-Average Floor Price (in dollars per barrel) | 75 |  | 75 |
Weighted-Average Ceiling Price (in dollars per barrel) | 110 |  | 110 |
Fuel Derivatives 2018 Maturity October 2014 Transaction Date |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels | bbl | 3,000 |  | 3,000 |
Weighted-Average Floor Price (in dollars per barrel) | 80 |  | 80 |
Weighted-Average Ceiling Price (in dollars per barrel) | 114 |  | 114 |
Fuel |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain (loss), net on derivatives | $ | $ (137) | 15 | $ (215) | 8
Realized gain (loss), net on derivatives | $ | $ (60) | $ 0 | $ (163) | $ 2

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