FAIR VALUE MEASUREMENTS (TABLES)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

Fair values of financial instruments on the consolidated balance sheet (in millions):

December 31, 2014	Level 1		Level 2			Total
Assets
Marketable securities
U.S. government and agency securities	$	166	$	—		$	166
Foreign government bonds	—		25			25
Asset-backed securities	—		130			130
Mortgage-backed securities	—		126			126
Corporate notes and bonds	—		645			645
Municipal securities	—		18			18
Derivative instruments
Fuel hedge contracts
Call options	—		7			7
Liabilities
Derivative instruments
Interest rate swap agreements	—		(19		)	(19		)

December 31, 2013	Level 1		Level 2			Total
Assets
Marketable securities
U.S. government and agency securities	$	294	$	—		$	294
Foreign government bonds	—		11			11
Asset-backed securities	—		146			146
Mortgage-backed securities	—		143			143
Corporate notes and bonds	—		630			630
Municipal securities	—		26			26
Derivative instruments
Fuel hedge contracts
Call options	—		16			16
Liabilities
Derivative instruments
Interest rate swap agreements	—		(17		)	(17		)

Fixed-rate debt that is not carried at fair value on the consolidated balance sheet and the estimated fair value of long-term fixed-rate debt (in millions):

	2014		2013
Carrying Amount	$	614	$	703
Fair value	666		762