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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2014
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 |
2014 |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 4,166 |  |  | $ | 5,011 |  |  | $ | 4,800 |  |  | $ | 4,628 |  | (a)
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 |  | 0.22 |  |  | 0.67 |  |  | 0.48 |  |  | 0.28 |  | (a)
Net income per share, diluted |  | 0.22 |  |  | 0.67 |  |  | 0.48 |  |  | 0.28 |  | (a)
|  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31 |
2013 |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 4,084 |  |  | $ | 4,643 |  |  | $ | 4,545 |  |  | $ | 4,428 |  |
Operating income |  | 70 |  |  | 433 |  |  | 390 |  |  | 386 |  |
Income (loss) before income taxes |  | 94 |  |  | 363 |  |  | 419 |  |  | 334 |  |
Net income (loss) |  | 59 |  |  | 224 |  |  | 259 |  |  | 212 |  |
Net income (loss) per share, basic |  | 0.08 |  |  | 0.31 |  |  | 0.37 |  |  | 0.30 |  |
Net income (loss) per share, diluted |  | 0.08 |  |  | 0.31 |  |  | 0.37 |  |  | 0.30 |  |
(a) Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $55 million and increased both Basic and Diluted net income per share by $.04. 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=35737889&loc=d3e1280-108306 + Details
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