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Legal Matters (Details) (SkyWest Airlines and ExpressJet v. Delta, USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2007 | Dec. 31, 2010 | Mar. 31, 2013 | Oct. 18, 2011
SkyWest Airlines and ExpressJet v. Delta |  |  |  |
Legal Matters |  |  |  |
Amount of receivables withheld from weekly scheduled wire payments to SkyWest Airlines and Atlantic Southeast | $ 25 |  |  |
Withheld receivables recognized as revenue by the entity |  |  | 31.7 |
Amount that the settlement offered by the reporting entity was less than the cumulative amount of withheld receivables recognized as revenue by the reporting entity |  | 5.9 |  |
Receivables written off by the entity |  | 5.9 |  |
Minimum amount of possible damages |  |  | 0 | 4.5
Settlement amount accrued |  |  | 3.0 |
Reasonably possible loss related to dispute, maximum |  |  | $ 25.8 |

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