Fair Value Measurements, Derivative Instruments and Hedging Activities - Fuel Derivatives Outstanding (Details) bbl in Thousands, $ in Millions	3 Months Ended
Feb. 28, 2017 USD ($) bbl $ / bbl	Feb. 29, 2016 USD ($)
Derivative [Line Items]
Gains (losses) on fuel derivatives, net \| $	$ 27	$ (236)
Fuel
Derivative [Line Items]
Unrealized gains (losses) on fuel derivatives, net \| $	72	(145)
Realized losses on fuel derivatives, net \| $	(45)	(91)
Gains (losses) on fuel derivatives, net \| $	$ 27	$ (236)
Fuel Derivatives 2017 Maturity February 2013 Transaction
Derivative [Line Items]
Barrels \| bbl	2,457
Weighted-Average Floor Price (in dollars per barrel)	80
Weighted-Average Ceiling Price (in dollars per barrel)	115
Fuel Derivatives 2017 Maturity April 2013 Transaction
Derivative [Line Items]
Barrels \| bbl	1,521
Weighted-Average Floor Price (in dollars per barrel)	75
Weighted-Average Ceiling Price (in dollars per barrel)	110
Fuel Derivatives 2017 Maturity Date January Twenty Fourteen Transaction [Member]
Derivative [Line Items]
Barrels \| bbl	1,350
Weighted-Average Floor Price (in dollars per barrel)	75
Weighted-Average Ceiling Price (in dollars per barrel)	114
Fuel Derivatives 2017 Maturity October 2014 Transaction
Derivative [Line Items]
Barrels \| bbl	765
Weighted-Average Floor Price (in dollars per barrel)	80
Weighted-Average Ceiling Price (in dollars per barrel)	113
Fuel Derivatives 2017 Maturity
Derivative [Line Items]
Barrels \| bbl	6,093
Fuel Derivatives 2018 Maturity January 2014 Transaction
Derivative [Line Items]
Barrels \| bbl	2,700
Weighted-Average Floor Price (in dollars per barrel)	75
Weighted-Average Ceiling Price (in dollars per barrel)	110
Fuel Derivatives 2018 Maturity October 2014 Transaction
Derivative [Line Items]
Barrels \| bbl	3,000
Weighted-Average Floor Price (in dollars per barrel)	80
Weighted-Average Ceiling Price (in dollars per barrel)	114
Fuel Derivatives 2018 Maturity
Derivative [Line Items]
Barrels \| bbl	5,700

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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