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Revenue - Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Mainline $ 8,045 $ 7,492 $ 14,661 $ 13,719
Regional 1,835 1,659 3,369 3,085
Total passenger revenue 9,880 9,151 [1] 18,030 16,804 [1]
International        
Disaggregation of Revenue [Line Items]        
Total passenger revenue 3,699 3,493 6,880 6,495
Domestic        
Disaggregation of Revenue [Line Items]        
Mainline 4,395 4,043 7,881 7,315
Regional 1,786 1,615 3,269 2,994
Total passenger revenue 6,181 5,658 11,150 10,309
Atlantic        
Disaggregation of Revenue [Line Items]        
Total passenger revenue 1,824 1,615 3,076 2,732
Pacific        
Disaggregation of Revenue [Line Items]        
Total passenger revenue 1,103 1,064 2,172 2,117
Latin America        
Disaggregation of Revenue [Line Items]        
Total passenger revenue $ 772 $ 814 $ 1,632 $ 1,646
[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.