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Significant Accounting Policies - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounting Policies [Abstract] |  |  |
Goodwill | $ 4,523 | $ 4,523 | [1]
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2,693 | 2,783 |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,756 | 1,756 |
Accumulated Amortization | 1,440 | 1,380 | [1]
Route authorities |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,150 | 1,240 |
Airport slots and gates |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 546 | 546 |
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 | 931 | 884 |
Hubs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 145 | 145 |
Accumulated Amortization | 104 | 97 |
Contracts |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 120 | 120 |
Accumulated Amortization | 111 | 106 |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 314 | 314 |
Accumulated Amortization | $ 294 | $ 293 |
[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 II, Item 8 of this report for additional information.

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