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Derivatives and Risk Management - Hedge Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Not designated as hedging instrument
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gains (losses) on derivatives recognized	$ (43)	$ (14)
Foreign currency exchange contracts | Designated as hedging instrument | Other Comprehensive income
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gains (losses) on derivatives recognized	1	1
Foreign currency exchange contracts | Designated as hedging instrument | Passenger
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gains (losses) reclassified from AOCI to Earnings	0	(4)
Foreign currency exchange contracts | Not designated as hedging instrument | Unrealized gain on investments, net
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gains (losses) on derivatives recognized	11	(16)
Fuel hedge contracts | Not designated as hedging instrument | Aircraft fuel and related taxes
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gains (losses) on derivatives recognized	$ (54)	$ 2

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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