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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at end of period	$ (1,051)	$ (738)
Fuel derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,666)	(1,177)	$ (20)
Changes in fair value	(867)	(1,191)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	378	34
Interest rate derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(30)	(45)	(58)
Changes in fair value	(5)	(10)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	20	23
Defined benefit plan items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	22	41	65
Changes in fair value	(19)	(24)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6	8	8
Changes in fair value	(2)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Deferred tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	617	435	2
Changes in fair value	329	454
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(147)	(21)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,051)	(738)	$ (3)
Changes in fair value	(564)	(771)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 251	$ 36

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Change in accumulated gains and losses from sources other than derivative instruments designated and qualifying as the effective portion of cash flow hedges, net of tax effect.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-Number 210
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-Paragraph 31
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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