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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | $ 9,589 | $ 9,032 | [1]
Passenger Revenue |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Ancillary fees | 571 | 497 |
Revenue | 8,725 | 8,149 | [1]
Passenger Revenue | Deferred Revenue for Miles in Loyalty Program |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | 2,700 | 2,500 |
Other Operating Revenue |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | 578 | 590 | [1]
Other Operating Revenue | Chase and Other Partner Agreements |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | $ 473 | $ 494 |
[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, 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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