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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information |
|  | Three months ended
(in millions except per share amounts) |  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2015 |  |  |  |  |  |  |  |
Operating revenues (a)(b) |  | $ | 4,414 |  |  | $ | 5,111 |  |  | $ | 5,318 |  |  | $ | 4,977 |
Operating income |  | 780 |  |  | 1,085 |  |  | 1,225 |  |  | 1,026 |
Income before income taxes |  | 723 |  |  | 977 |  |  | 933 |  |  | 847 |
Net income |  | 453 |  |  | 608 |  |  | 584 |  |  | 536 |
Net income per share, basic (a)(b) |  | 0.67 |  |  | 0.91 |  |  | 0.89 |  |  | 0.83 |
Net income per share, diluted (a)(b) |  | 0.66 |  |  | 0.90 |  |  | 0.88 |  |  | 0.82 |
|  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2014 |  |  |  |  |  |  |  |
Operating revenues (a) |  | $ | 4,166 |  |  | $ | 5,011 |  |  | $ | 4,800 |  |  | $ | 4,628 |
Operating income |  | 215 |  |  | 775 |  |  | 614 |  |  | 621 |
Income before income taxes |  | 244 |  |  | 746 |  |  | 525 |  |  | 302 |
Net income |  | 152 |  |  | 465 |  |  | 329 |  |  | 190 |
Net income per share, basic (a) |  | 0.22 |  |  | 0.67 |  |  | 0.48 |  |  | 0.28 |
Net income per share, diluted (a) |  | 0.22 |  |  | 0.67 |  |  | 0.48 |  |  | 0.28 |
(a) 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. (b) 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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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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