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New Accounting Pronouncements - Adjustments (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue $ 5,575 $ 5,303 $ 16,261 $ 15,888  
Accrued Liabilities, Current 1,517   1,517   $ 1,700
Air traffic liability 4,756   4,756   3,495
Air traffic liability - noncurrent 827   827   1,070
Deferred income taxes 2,553   2,553   2,119
Retained earnings 15,402   15,402   13,832
Salaries, wages, and benefits 1,912 1,791 5,659 5,385  
Fuel and oil 1,205 1,037 3,425 3,016  
Other operating expenses 739 741 2,096 2,154  
Other (gains) losses, net (8) (9) (16) (115)  
PROVISION FOR INCOME TAXES 171 304 536 920  
Net income 615 528 1,811 1,610  
Deferred income taxes $ 104 $ 98 $ 308 $ 219  
NET INCOME PER SHARE, BASIC $ 1.08 $ 0.88 $ 3.13 $ 2.66  
NET INCOME PER SHARE, DILUTED $ 1.08 $ 0.88 $ 3.13 $ 2.66  
Changes in certain assets and liabilities   $ (96)   $ 358  
Net Cash Provided by operating activities $ 1,271 996 $ 3,904 3,366  
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
Salaries, wages, and benefits   1,795   5,395  
Fuel and oil   1,003   2,915  
Other operating expenses   750   2,179  
Other (gains) losses, net   39   207  
PROVISION FOR INCOME TAXES   288   913  
Net income   503   1,600  
Deferred income taxes   $ 82   $ 213  
NET INCOME PER SHARE, BASIC   $ 0.84   $ 2.65  
NET INCOME PER SHARE, DILUTED   $ 0.84   $ 2.64  
Changes in certain assets and liabilities   $ (55)   $ 374  
Net Cash Provided by operating activities   996   3,366  
Adjustments for New Accounting Principle, ASU 2017-12 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Salaries, wages, and benefits   0   0  
Fuel and oil   34   102  
Other operating expenses   0   0  
Other (gains) losses, net   (34)   (102)  
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)
Salaries, wages, and benefits   $ 0   $ 0  
Fuel and oil   0   0  
Other operating expenses   (9)   (25)  
Other (gains) losses, net   0   0  
PROVISION FOR INCOME TAXES   16   6  
Net income   25   10  
Deferred income taxes   $ 16   $ 6  
NET INCOME PER SHARE, BASIC   $ 0.04   $ 0.01  
NET INCOME PER SHARE, DILUTED   $ 0.04   $ 0.02  
Changes in certain assets and liabilities   $ (41)   $ (16)  
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]          
Salaries, wages, and benefits   (4)   (10)  
Fuel and oil   0   0  
Other operating expenses   0   0  
Other (gains) losses, net   4   10  
PROVISION FOR INCOME TAXES   0   0  
Net income   $ 0   $ 0  
NET INCOME PER SHARE, BASIC   $ 0   $ 0  
NET INCOME PER SHARE, DILUTED   $ 0   $ 0  
Passenger          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue 5,194 $ 4,944 15,137 $ 14,869  
Passenger | Scenario, Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   4,745   14,403  
Passenger | Adjustments for New Accounting Principle, ASU 2017-12 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   0   0  
Passenger | ASU 2014-09 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   199   466  
Passenger | Adjustments for New Accounting Pronouncement, 2017-07 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   0   0  
Other          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue $ 338 317 $ 994 891  
Other | Scenario, Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   484   1,366  
Other | Adjustments for New Accounting Principle, ASU 2017-12 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   0   0  
Other | ASU 2014-09 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   (167)   (475)  
Other | Adjustments for New Accounting Pronouncement, 2017-07 | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Revenue   $ 0   $ 0