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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.