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Fair Value Measurements, Derivative Instruments and Hedging Activities and Financial Risks - Fuel Derivatives Outstanding (Details) bbl in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2018 USD ($) $ / bbl bbl | May 31, 2017 USD ($) | May 31, 2018 USD ($) $ / bbl | May 31, 2017 USD ($)
Derivative [Line Items] |  |  |  |
Gains (losses) on fuel derivatives, net | $ | $ 41 | $ (53) | $ 57 | $ (27)
Fuel |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gains (losses) on fuel derivatives, net | $ | 50 | (2) | 82 | 69
Realized losses on fuel derivatives, net | $ | (9) | (51) | (25) | (96)
Gains (losses) on fuel derivatives, net | $ | $ 41 | $ (53) | $ 57 | $ (27)
Fuel Derivatives 2018 Maturity January 2014 Transaction |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 1,350 |  |  |
Weighted-average floor price (in dollars per barrel) | $ / bbl | 75 |  | 75 |
Weighted-average ceiling price (in dollars per barrel) | $ / bbl | 110 |  | 110 |
Fuel Derivatives 2018 Maturity October 2014 Transaction |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 1,500 |  |  |
Weighted-average floor price (in dollars per barrel) | $ / bbl | 80 |  | 80 |
Weighted-average ceiling price (in dollars per barrel) | $ / bbl | 114 |  | 114 |
Fuel Derivatives 2018 Maturity |  |  |  |
Derivative [Line Items] |  |  |  |
Barrels (in thousands) | bbl | 2,850 |  |  |

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