FAIR VALUE MEASUREMENTS (TABLES)

12 Months Ended

Dec. 31, 2013

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

December 31, 2012	Level 1		Level 2			Total
Assets
Marketable securities
U.S. government and agency securities	$	272	$	—		$	272
Foreign government bonds	—		51			51
Asset-back securities	—		62			62
Mortgage-back securities	—		137			137
Corporate notes and bonds	—		585			585
Municipal securities	—		23			23
Derivative instruments
Fuel hedge contracts
Call options	—		65			65
Liabilities
Derivative instruments
Fuel hedge contracts
Swap agreements	—		(1		)	(1		)
Interest rate swap agreements	—		(33		)	(33		)

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 as of December 31 (in millions):

	2013		2012
Carrying Amount	$	703	$	844
Fair value	762		915