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Goodwill and Other Intangible Assets - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Goodwill | $ 4,523 | $ 4,523 | [1]
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,756 | 1,757 |
Accumulated amortization | 1,380 | 1,313 | [1]
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 2,783 | 3,095 |
Route authorities |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,240 | 1,562 |
Airport slots and gates |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 546 | 536 |
Tradenames and logos |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 593 | 593 |
Alliances |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 404 | 404 |
Frequent flyer database |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,177 | 1,177 |
Accumulated amortization | 884 | 832 |
Hubs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 145 | 145 |
Accumulated amortization | 97 | 89 |
Contracts |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 120 | 121 |
Accumulated amortization | 106 | 103 |
Patents and tradenames |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 108 | 108 |
Accumulated amortization | 108 | 108 |
Airport slots and gates |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 97 | 97 |
Accumulated amortization | 97 | 97 |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 109 | 109 |
Accumulated amortization | $ 88 | $ 84 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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