Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring, Settlement and Impairment Provisions	$ 452	$ 242	$ 450
Number of Slot Pairs Acquired		132
Number of Slot Pairs Sold		42
Payments to Acquire Intangible Assets		66.5
Proceeds from Sale of Intangible Assets		90
Finite-Lived Intangible Assets, Amortization Expense	70	70	70
Impairment of Intangible Assets [Member]
Restructuring, Settlement and Impairment Provisions	0	50	0
Gain on slot exchange and divestiture [Member]
Restructuring, Settlement and Impairment Provisions	$ (78)	$ (43)	$ 0
LaGuardia [Member]
Number of Slot Pairs Divested		16
Reagan National [Member]
Number of Slot Pairs Divested		8