Fair Value Measurements, Derivative Instruments and Hedging Activities and Financial Risks - Fuel Derivatives Outstanding (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Derivative [Line Items]
Gains (losses) on fuel derivatives, net	$ 4	$ 7	$ 61	$ (19)
Fuel
Derivative [Line Items]
Unrealized gains on fuel derivatives, net	8	65	90	134
Realized losses on fuel derivatives, net	(4)	(57)	(29)	(153)
Gains (losses) on fuel derivatives, net	$ 4	$ 7	$ 61	$ (19)

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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