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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Fair values of derivative instruments on the consolidated balance sheet (in millions):
 
2015
 
2014
Derivative Instruments Not Designated as Hedges
 
 
 
Fuel hedge contracts
 
 
 
Prepaid expenses and other current assets
$
2

 
$
3

Other assets
2

 
4

 
 
 
 
Derivative Instruments Designated as Hedges
 
 
 
Interest rate swaps
 
 
 
Other accrued liabilities
(5
)
 
(6
)
Other liabilities
(13
)
 
(13
)
Losses in accumulated other comprehensive loss (AOCL)
(18
)
 
(19
)
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
Pretax effect of derivative instruments on earnings and AOCL (in millions):
 
2015
 
2014
 
2013
Derivative Instruments Not Designated as Hedges
 
 
 
 
 
Fuel hedge contracts
 
 
 
 
 
Gains (losses) recognized in aircraft fuel expense
$
(19
)
 
$
(18
)
 
$
(44
)
 
 
 
 
 
 
Derivative Instruments Designated as Hedges
 
 
 
 
 
Interest rate swaps
 
 
 
 
 
Gains (losses) recognized in aircraft rent
(6
)
 
(6
)
 
(6
)
Gains (losses) recognized in other comprehensive income (OCI)
(5
)
 
(8
)
 
10