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Airtran Acquisition and Related Matters (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |  |
Acquisition and integration | $ 39 | $ 126 | $ 86

X
- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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- References No definition available. + Details
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