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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ 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
NUMERATOR:                      
Net income $ 536 $ 584 $ 608 $ 453 $ 190 $ 329 $ 465 $ 152 $ 2,181 $ 1,136 $ 754
Incremental income effect of interest on 5.25% convertible notes                 4 4 3
Net income after assumed conversion                 $ 2,185 $ 1,140 $ 757
DENOMINATOR:                      
Weighted-average shares outstanding, basic                 661 687 710
Dilutive effect of Employee stock options and restricted stock units                 2 3 2
Dilutive effect of 5.25% convertible notes                 6 6 6
Adjusted weighted-average shares outstanding, diluted                 669 696 718
NET INCOME PER SHARE:                      
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
Stock Options                      
Potentially dilutive amounts excluded from calculations:                      
Potentially dilutive amounts excluded from calculations:                 0 0 9
[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.