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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Operating revenue | $ 11,402 | $ 10,777 | [1] | $ 20,991 | $ 19,809 | [1]
Advance Ticket Sales |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Revenue recognized | 3,900 | 3,500 |  | 3,200 | 2,900 |
Ancillary Fees |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Operating revenue | 636 | 555 |  | 1,200 | 1,100 |
Frequent Flyer |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Operating revenue | $ 499 | $ 480 |  | $ 972 | $ 974 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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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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