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Commitments and Contingencies (Details 2) (SkyWest Airlines and ExpressJet v. Delta, USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Dec. 31, 2007	Dec. 31, 2010	Dec. 31, 2011	Sep. 22, 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
Minimum amount of possible damages			0	4.5
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
Reasonably possible loss related to dispute, maximum			25.8
Receivables written off by the entity		$ 5.9

X

- Definition

Represents the cumulative amount of withheld receivables recognized as revenue by the entity.

+ References

No definition available.

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X

- Definition

Represents the amount of receivables withheld by the other entity in pursuant with discrepancy in providing services under the agreements.

+ References

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- Definition

The 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.

+ References

No definition available.

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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- Definition

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