FAIR VALUE MEASUREMENTS (TABLES)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

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

September 30, 2014	Level 1		Level 2			Total
Assets
Marketable securities
U.S. government and agency securities	$	203	$	—		$	203
Foreign government bonds	—		21			21
Asset-backed securities	—		166			166
Mortgage-backed securities	—		149			149
Corporate notes and bonds	—		749			749
Municipal securities	—		21			21
Derivative instruments
Fuel hedge call options	—		4			4
Liabilities
Derivative instruments
Interest rate swap agreements	—		(17		)	(17		)

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 call options	—		16			16
Liabilities
Derivative instruments
Interest rate swap agreements	—		(17		)	(17		)

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

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):

	September 30, 2014		December 31, 2013
Carrying amount	$	633	$	703
Fair value	687		762