Slot Divestiture (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Noncash or Part Noncash Divestitures [Line Items]
Net proceeds from slot transaction	$ 307	$ 307	$ 0
Gain related to sale of DCA slots	309	309
AA [Member]
Noncash or Part Noncash Divestitures [Line Items]
Net proceeds from slot transaction	299	299	0
Number of slots sold, John F. Kennedy Airport (slots)	24
Gain related to sale of DCA slots	$ 305	$ 305
John F. Kennedy Airport [Member]
Noncash or Part Noncash Divestitures [Line Items]
Number of slots sold, John F. Kennedy Airport (slots)	24