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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 1,008	$ 5,909	$ 5,242	$ 11,059
Passenger Revenue Non Loyalty
Disaggregation of Revenue [Line Items]
Operating Revenue	562	4,683	3,783	8,726
Passenger Loyalty Air Transportation
Disaggregation of Revenue [Line Items]
Operating Revenue	81	622	542	1,158
Passenger Ancillary Sold Separately
Disaggregation of Revenue [Line Items]
Operating Revenue	61	182	224	347
Passenger
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 704	$ 5,487	$ 4,549	$ 10,231

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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