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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.

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