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New Accounting Pronouncements - Adjustments (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
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued Liabilities, Current $ 1,361   $ 1,361   $ 1,700
Air traffic liability 4,652   4,652   3,495
Air traffic liability - noncurrent 878   878   1,070
Deferred income taxes 2,414   2,414   2,119
Retained earnings 14,878   14,878   13,832
Passenger Revenue 5,358 $ 5,379 9,943 $ 9,925  
Other Revenue, Net 340 308 656 574  
Salaries, wages, and benefits 1,927 1,863 3,748 3,594  
Fuel and oil 1,202 1,024 2,220 1,979  
Other operating expenses 731 727 1,355 1,414  
Other (gains) losses, net (4) (44) (8) (106)  
PROVISION FOR INCOME TAXES 227 422 366 616  
Net income 733 743 1,195 1,082  
Deferred income taxes $ 131 $ 68 $ 203 $ 121  
NET INCOME PER SHARE, BASIC $ 1.27 $ 1.23 $ 2.05 $ 1.78  
NET INCOME PER SHARE, DILUTED $ 1.27 $ 1.23 $ 2.05 $ 1.77  
Changes in certain assets and liabilities   $ (440)   $ 454  
Net Cash Provided by operating activities $ 1,631 746 $ 2,632 2,370  
Scenario, Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued Liabilities         1,777
Air traffic liability         3,460
Air traffic liability - noncurrent         0
Deferred income taxes         2,358
Retained earnings         14,621
Passenger Revenue   5,233   9,658  
Other Revenue, Net   467   883  
Salaries, wages, and benefits   1,867   3,600  
Fuel and oil   990   1,912  
Other operating expenses   735   1,431  
Other (gains) losses, net   74   167  
PROVISION FOR INCOME TAXES   424   626  
Net income   746   1,097  
Deferred income taxes   $ 69   $ 131  
NET INCOME PER SHARE, BASIC   $ 1.24   $ 1.80  
NET INCOME PER SHARE, DILUTED   $ 1.23   $ 1.80  
Changes in certain assets and liabilities   $ (444)   $ 429  
Net Cash Provided by operating activities   746   2,370  
Adjustments for New Accounting Principle, ASU 2017-12 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Passenger Revenue   0   0  
Other Revenue, Net   0   0  
Salaries, wages, and benefits   0   0  
Fuel and oil   34   67  
Other operating expenses   0   0  
Other (gains) losses, net   (34)   (67)  
PROVISION FOR INCOME TAXES   0   0  
Net income   $ 0   $ 0  
NET INCOME PER SHARE, BASIC   $ 0   $ 0  
NET INCOME PER SHARE, DILUTED   $ 0   $ 0  
ASU 2014-09 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued Liabilities         (77)
Air traffic liability         35
Air traffic liability - noncurrent         1,070
Deferred income taxes         (239)
Retained earnings         $ (789)
Passenger Revenue   $ 146   $ 267  
Other Revenue, Net   (159)   (309)  
Salaries, wages, and benefits   0   0  
Fuel and oil   0   0  
Other operating expenses   (8)   (17)  
Other (gains) losses, net   0   0  
PROVISION FOR INCOME TAXES   (2)   (10)  
Net income   (3)   (15)  
Deferred income taxes   $ (1)   $ (10)  
NET INCOME PER SHARE, BASIC   $ (0.01)   $ (0.02)  
NET INCOME PER SHARE, DILUTED   $ 0   $ (0.03)  
Changes in certain assets and liabilities   $ 4   $ 25  
Net Cash Provided by operating activities   0   0  
Adjustments for New Accounting Pronouncement, 2017-07 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Passenger Revenue   0   0  
Other Revenue, Net   0   0  
Salaries, wages, and benefits   (4)   (6)  
Fuel and oil   0   0  
Other operating expenses   0   0  
Other (gains) losses, net   4   6  
PROVISION FOR INCOME TAXES   0   0  
Net income   $ 0   $ 0  
NET INCOME PER SHARE, BASIC   $ 0   $ 0  
NET INCOME PER SHARE, DILUTED   $ 0   $ 0