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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Data [Abstract]                      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Revenue $ 124 $ 303             $ 427    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share $ 0.10 $ 0.24             $ 0.34    
Change in Accounting Estimate Financial Effect on Passenger Revenue   $ 30 $ 41 $ 43 $ 55       $ 115 $ 55  
Change in accounting estimate,financial effect on earnings per share   $ 0.02 $ 0.03 $ 0.03 $ 0.04       $ 0.09 $ 0.04  
Revenues $ 4,977 $ 5,318 [1],[2] $ 5,111 [1],[2] $ 4,414 [1],[2] $ 4,628 [1] $ 4,800 $ 5,011 $ 4,166 $ 19,820 $ 18,605 $ 17,699
Operating income 1,026 1,225 1,085 780 621 614 775 215 4,116 2,225 1,278
Income before income taxes 847 933 977 723 302 525 746 244 3,479 1,816 1,209
Net income $ 536 $ 584 $ 608 $ 453 $ 190 $ 329 $ 465 $ 152 $ 2,181 $ 1,136 $ 754
Basic (in dollars per share) $ 0.83 $ 0.89 [1],[2] $ 0.91 [1],[2] $ 0.67 [1],[2] $ 0.28 [1] $ 0.48 $ 0.67 $ 0.22 $ 3.30 $ 1.65 $ 1.06
Diluted (in dollars per share) $ 0.82 $ 0.88 [1] $ 0.90 [1] $ 0.66 [1] $ 0.28 [1] $ 0.48 $ 0.67 $ 0.22 $ 3.27 $ 1.64 $ 1.05
[1] Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail.
[2] Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.