New Accounting Pronouncements (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Revenue	$ 106	$ 161
Special revenue item	107	107
Per basic share	$ 0.32	$ 0.49
Per diluted share	$ 0.27	$ 0.42
Special Revenue Item [Member]
Special revenue item	107	107
Per basic share	$ 0.32	$ 0.33
Per diluted share	$ 0.27	$ 0.28
Co-Brand Agreement [Member]
Expected increase to other sales revenue per quarter		70
Quarterly reduction in passenger revenue for remainder of year		$ 20