LEASES Sublease Table (Details) (B-717-200 Aircraft, USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
B-717-200 Aircraft
B717 Sublease Liability [Line Items]
Interest Expense, Accretion	$ 2		$ 6
Sublease Transaction Costs	(29)	[1]	(12)	[1]
Sublease Obligations	$ 95		$ 122		$ 128

[1] Includes lease conversion cost payments