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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Revenue From Contract With Customer [Line Items] |  |
Expiration period for electronic travel certificates | 24 months |
Operating revenue | $ 7,979 | $ 9,589
Advance Ticket Sales |  |
Revenue From Contract With Customer [Line Items] |  |
Revenue recognized | 2,600 | 2,700
Ancillary Fees |  |
Revenue From Contract With Customer [Line Items] |  |
Operating revenue | 476 | 571
Other Operating Revenue |  |
Revenue From Contract With Customer [Line Items] |  |
Operating revenue | 650 | 578
Other Operating Revenue | Chase and Other Partner Agreements |  |
Revenue From Contract With Customer [Line Items] |  |
Operating revenue | $ 530 | $ 473

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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- Definition 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 + Details
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