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New Accounting Pronouncements - Adjustments (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued Liabilities     $ 1,700
Air traffic liability $ 4,420   3,495
Air traffic liability - loyalty noncurrent 1,010   1,070
Deferred income taxes 2,216   2,119
Retained earnings 14,238   13,832
Passenger Revenue 4,585 $ 4,546  
Other Revenue, Net 317 266  
Salaries, wages, and benefits 1,821 1,730  
Fuel and oil 1,018 956  
Other operating expenses 625 688  
Other (gains) losses, net (4) 63  
PROVISION FOR INCOME TAXES 139 193  
Net income 463 339  
Deferred income taxes $ 72 $ 54  
NET INCOME PER SHARE, BASIC $ 0.79 $ 0.55  
NET INCOME PER SHARE, DILUTED $ 0.79 $ 0.55  
Changes in certain assets and liabilities   $ 894  
Net Cash Provided by operating activities $ 1,002 1,625  
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 - loyalty noncurrent     0
Deferred income taxes     2,358
Retained earnings     14,621
Passenger Revenue   4,424  
Other Revenue, Net   417  
Salaries, wages, and benefits   1,733  
Fuel and oil   922  
Other operating expenses   696  
Other (gains) losses, net   94  
PROVISION FOR INCOME TAXES   202  
Net income   351  
Deferred income taxes   $ 62  
NET INCOME PER SHARE, BASIC   $ 0.57  
NET INCOME PER SHARE, DILUTED   $ 0.57  
Changes in certain assets and liabilities   $ 874  
Net Cash Provided by operating activities   1,625  
Adjustments for New Accounting Principle, ASU 2017-12 | Restatement Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Passenger Revenue   0  
Other Revenue, Net   0  
Salaries, wages, and benefits   0  
Fuel and oil   34  
Other operating expenses   0  
Other (gains) losses, net   (34)  
PROVISION FOR INCOME TAXES   0  
Net income   $ 0  
NET INCOME PER SHARE, BASIC   $ 0  
NET INCOME PER SHARE, DILUTED   $ 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 - loyalty noncurrent     1,070
Deferred income taxes     (239)
Retained earnings     $ (789)
Passenger Revenue   $ 122  
Other Revenue, Net   (151)  
Salaries, wages, and benefits   0  
Fuel and oil   0  
Other operating expenses   (8)  
Other (gains) losses, net   0  
PROVISION FOR INCOME TAXES   (9)  
Net income   (12)  
Deferred income taxes   $ (9)  
NET INCOME PER SHARE, BASIC   $ (0.02)  
NET INCOME PER SHARE, DILUTED   $ (0.02)  
Changes in certain assets and liabilities   $ 21  
Net Cash Provided by operating activities   0  
Adjustments for New Accounting Pronouncement, 2017-07 | Restatement Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Passenger Revenue   0  
Other Revenue, Net   0  
Salaries, wages, and benefits   (3)  
Fuel and oil   0  
Other operating expenses   0  
Other (gains) losses, net   3  
PROVISION FOR INCOME TAXES   0  
Net income   $ 0  
NET INCOME PER SHARE, BASIC   $ 0  
NET INCOME PER SHARE, DILUTED   $ 0