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Significant Accounting Policies - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounting Policies [Abstract] |  |
Goodwill | $ 4,527 | $ 4,527
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,591 | 2,591
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,629 | 1,643
Accumulated Amortization | 1,495 | 1,472
China route authority |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,020 | 1,020
Airport slots |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 574 | 574
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 | 1,068 | 1,040
Hubs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 145 | 145
Accumulated Amortization | 131 | 124
Contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 0 | 7
Accumulated Amortization | 0 | 7
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 307 | 314
Accumulated Amortization | $ 296 | $ 301

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