Merger and Related Matters (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 09, 2013
Business Combinations [Abstract]
Gain related to sale of LGA slots	$ 67	$ (67)	[1]	$ 0	[1]	$ 0	[1]
Exchange price per share								$ 22.55

[1] Recognition of a $67 million gain on the sale of slots at LaGuardia and Ronald Regan Washington National Airport as part of the settlement reached with the Department of Justice.