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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value, Measurement Inputs, Disclosure
Fair values of financial instruments on the consolidated balance sheet (in millions):
September 30, 2015
Level 1
 
Level 2
 
Total
Assets
 
 
 
 
 
Marketable securities
 
 
 
 
 
U.S. government and agency securities
$
189

 
$
—

 
$
189

All other securities
—

 
981

 
981

Derivative instruments
 
 
 
 
 
Fuel hedge call options
—

 
5

 
5

 
 
 
 
 
 
Liabilities
 
 
 
 
 
Derivative instruments
 
 
 
 
 
Interest rate swap agreements
—

 
(22
)
 
(22
)

December 31, 2014
Level 1
 
Level 2
 
Total
Assets
 
 
 
 
 
Marketable securities
 
 
 
 
 
U.S. government and agency securities
$
166

 
$
—

 
$
166

All other securities
—

 
944

 
944

Derivative instruments
 
 
 
 
 
Fuel hedge call options
—

 
7

 
7

 
 
 
 
 
 
Liabilities
 
 
 
 
 
Derivative instruments
 
 
 
 
 
Interest rate swap agreements
—

 
(19
)
 
(19
)
Fair Value, by Balance Sheet Grouping

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,
2015
 
December 31,
2014
Carrying amount
$
540

 
$
614

Fair value
575

 
666