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Significant Accounting Policies - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Goodwill	$ 4,527	$ 4,523
Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying Amount	2,577	2,693
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,756	1,756
Accumulated Amortization	1,495	1,440
Route authorities
Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying Amount	1,020	1,150
Airport slots and gates
Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying Amount	560	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	971	931
Hubs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	145	145
Accumulated Amortization	111	104
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	120	120
Accumulated Amortization	116	111
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	314	314
Accumulated Amortization	$ 297	$ 294

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