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Revenue - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Deferred Revenue Arrangement [Line Items]        
Refundable tickets expiration period     1 year  
Revenue $ 11,003 $ 9,899 [1] $ 30,812 $ 28,333 [2]
Frequent flyer mileage program expiration period after member account inactivity     18 months  
Frequent flyer mileage program period in which miles redeemed     2 years  
Passenger Revenue        
Deferred Revenue Arrangement [Line Items]        
Ancillary fees 572 538 $ 1,600 1,500
Minimum        
Deferred Revenue Arrangement [Line Items]        
Frequent flyer mileage program expiration period     1 year  
Maximum        
Deferred Revenue Arrangement [Line Items]        
Frequent flyer mileage program expiration period     8 years  
Deferred Revenue for Miles in Loyalty Program        
Deferred Revenue Arrangement [Line Items]        
Advance tickets expiration period     12 months  
Passenger revenue        
Deferred Revenue Arrangement [Line Items]        
Revenue 10,120 9,069 [1] $ 28,150 25,873 [2]
Passenger revenue | Deferred Revenue for Miles in Loyalty Program        
Deferred Revenue Arrangement [Line Items]        
Revenue 3,200 2,900 2,300 2,300
Other operating revenue        
Deferred Revenue Arrangement [Line Items]        
Revenue 587 551 [1] 1,759 1,670 [2]
Other operating revenue | Chase and Other Partner Agreements        
Deferred Revenue Arrangement [Line Items]        
Revenue $ 480 $ 441 $ 1,500 $ 1,300
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.