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Significant Accounting Policies - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
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	1,643	1,756
Accumulated Amortization	1,472	1,544
Route authorities
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	1,040	1,008
Hubs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	145	145
Accumulated Amortization	124	118
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7	120
Accumulated Amortization	7	120
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	314	314
Accumulated Amortization	$ 301	$ 298

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