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Significant Accounting Policies - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Goodwill | $ 4,527 | $ 4,527
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,591 | 2,577
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,756 | 1,756
Accumulated Amortization | 1,544 | 1,495
Route authorities |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,020 | 1,020
Airport slots and gates |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 574 | 560
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 | 1,008 | 971
Hubs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 145 | 145
Accumulated Amortization | 118 | 111
Contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 120 | 120
Accumulated Amortization | 120 | 116
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 314 | 314
Accumulated Amortization | $ 298 | $ 297

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