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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 5,639	$ 5,575	$ 16,698	$ 16,261
Passenger Revenue Non Loyalty
Disaggregation of Revenue [Line Items]
Operating Revenue	4,400	4,417	13,126	12,969
Passenger Loyalty Air Transportation
Disaggregation of Revenue [Line Items]
Operating Revenue	657	623	1,814	1,702
Passenger Ancillary Sold Separately
Disaggregation of Revenue [Line Items]
Operating Revenue	173	154	522	466
Passenger
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 5,230	$ 5,194	$ 15,462	$ 15,137

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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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