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Airtran Acquisition and Related Matters (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Acquisition and integration	$ 126us-gaap_BusinessCombinationIntegrationRelatedCosts	$ 86us-gaap_BusinessCombinationIntegrationRelatedCosts	$ 183us-gaap_BusinessCombinationIntegrationRelatedCosts

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration