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Fair Value Measurements, Derivative Instruments and Hedging Activities - Fuel Derivatives Outstanding (Details) bbl in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2017 USD ($) bbl $ / bbl | Aug. 31, 2016 USD ($) | Aug. 31, 2017 USD ($) bbl $ / bbl | Aug. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |
Gains (losses) on fuel derivatives, net | $ | $ 7 | $ (36) | $ (19) | $ (102)
Fuel |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gains on fuel derivatives, net | $ | 65 | 25 | 134 | 121
Realized losses on fuel derivatives, net | $ | (57) | (61) | (153) | (223)
Gains (losses) on fuel derivatives, net | $ | $ 7 | $ (36) | $ (19) | $ (102)
Fuel Derivatives 2017 Maturity February 2013 Transaction |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 819 |  | 819 |
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 |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 507 |  | 507 |
Weighted-average floor price (in dollars per barrel) | 75 |  | 75 |
Weighted-average ceiling price (in dollars per barrel) | 110 |  | 110 |
Fuel Derivatives 2017 Maturity Date January 2014 Transaction |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 450 |  | 450 |
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 |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 255 |  | 255 |
Weighted-average floor price (in dollars per barrel) | 80 |  | 80 |
Weighted-average ceiling price (in dollars per barrel) | 113 |  | 113 |
Fuel Derivatives 2017 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 2,031 |  | 2,031 |
Fuel Derivatives 2018 Maturity January 2014 Transaction |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | 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 |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | 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 Derivatives 2018 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 5,700 |  | 5,700 |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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