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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 4,585	$ 4,546
Passenger Revenue Non Loyalty
Disaggregation of Revenue [Line Items]
Passenger Revenue	3,948	3,907
Passenger Loyalty Air Transportation
Disaggregation of Revenue [Line Items]
Passenger Revenue	491	507
Passenger Ancillary Sold Separately
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 146	$ 132

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- Definition

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.

+ References

No definition available.

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- Definition

A transportation (plane, train, ship) carrier's fare revenue recognized in the period from carrying passengers between destinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Details

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