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Recently Issued Accounting Standards - Schedule of Adoption of ASC 606 and Expected Impact (Statement of Operations) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Passenger revenue $ 9,880 $ 9,151 [1] $ 18,030 $ 16,804 [1]
Cargo 314 273 [1] 607 511 [1]
Other operating revenue 583 584 [1] 1,172 1,119 [1]
Total operating revenue 10,777 10,008 [1] 19,809 18,434 [1]
Salaries and related costs 2,878 2,842 [1] 5,604 5,478 [1]
Distribution expenses 393 385 [1] 735 704 [1]
Other operating expenses 1,428 1,381 [1] 2,826 2,690 [1]
Total operating expenses 9,616 8,571 [1] 18,372 16,677 [1]
Operating income 1,161 1,437 [1] 1,437 1,757 [1]
Interest expense (177) (167) [1] (353) (329) [1]
Miscellaneous, net (166) (27) [1] (118) (69) [1]
Total nonoperating expense, net (304) (160) [1] (396) (330) [1]
Income before income taxes 857 1,277 [1] 1,041 1,427 [1]
Income tax expense 173 456 [1] 210 507 [1]
Net income $ 684 $ 821 [1],[2] $ 831 $ 920 [1],[2]
Earnings per share, basic (in dollars per share) $ 2.49 $ 2.67 [1] $ 2.97 $ 2.96 [1]
Earnings per share, diluted (in dollars per share) $ 2.48 $ 2.67 [1] $ 2.96 $ 2.96 [1]
As Previously Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Passenger revenue   $ 8,622   $ 15,796
Cargo   254   474
Other operating revenue   1,124   2,150
Total operating revenue   10,000   18,420
Salaries and related costs   2,868   5,529
Distribution expenses   362   669
Other operating expenses   1,408   2,740
Total operating expenses   8,601   16,743
Operating income   1,399   1,677
Interest expense   (158)   (308)
Miscellaneous, net   (1)   (18)
Total nonoperating expense, net   (125)   (258)
Income before income taxes   1,274   1,419
Income tax expense   456   505
Net income   $ 818   $ 914
Earnings per share, basic (in dollars per share)   $ 2.67   $ 2.95
Earnings per share, diluted (in dollars per share)   $ 2.66   $ 2.94
Restatement Adjustment | Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Passenger revenue   $ 529   $ 1,008
Cargo   19   37
Other operating revenue   (540)   (1,031)
Total operating revenue   8   14
Salaries and related costs   0   0
Distribution expenses   23   35
Other operating expenses   (27)   (50)
Total operating expenses   (4)   (15)
Operating income   12   29
Interest expense   (9)   (21)
Miscellaneous, net   0   0
Total nonoperating expense, net   (9)   (21)
Income before income taxes   3   8
Income tax expense   0   2
Net income   $ 3   $ 6
Earnings per share, basic (in dollars per share)   $ 0.00   $ 0.01
Earnings per share, diluted (in dollars per share)   $ 0.01   $ 0.02
Restatement Adjustment | Accounting Standards Update 2017-06        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Passenger revenue   $ 0   $ 0
Cargo   0   0
Other operating revenue   0   0
Total operating revenue   0   0
Salaries and related costs   (26)   (51)
Distribution expenses   0   0
Other operating expenses   0   0
Total operating expenses   (26)   (51)
Operating income   26   51
Interest expense   0   0
Miscellaneous, net   (26)   (51)
Total nonoperating expense, net   (26)   (51)
Income before income taxes   0   0
Income tax expense   0   0
Net income   $ 0   $ 0
Earnings per share, basic (in dollars per share)   $ 0.00   $ 0.00
Earnings per share, diluted (in dollars per share)   $ 0.00   $ 0.00
[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.