Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Slot Pairs Acquired			132
Number of Slot Pairs Sold			42
Payments to Acquire Intangible Assets			$ 67
Proceeds from Sale of Intangible Assets			90
Restructuring and other items	402	452	242
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			50
Definite-Lived Intangible Assets, Amortization Expense	70	70	70
Gain on slot exchange and divestiture [Member] [Member]
Restructuring and other items			(43)
Routes and slots [Member]
Restructuring and other items	0	(78)	7
Net loss from restructuring and other charges [Member]
Restructuring and other items			$ 7
LaGuardia [Member]
Number of Slot Pairs Divested			16
Reagan National [Member]
Number of Slot Pairs Divested			8