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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
2017
 
2016
Fuel hedge contracts (not designated as hedges)
 
 
 
Prepaid expenses and other current assets
$
19

 
$
17

Other assets
3

 
3

Interest rate swaps (designated as hedges)
 
 
 
Prepaid expenses and other current assets
1

 
—

Other noncurrent assets
8

 
—

Other accrued liabilities
(3
)
 
(5
)
Other liabilities
(5
)
 
—

Losses in accumulated other comprehensive loss (AOCL)
(2
)
 
(5
)
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):
 
2017
 
2016
 
2015
Fuel hedge contracts (not designated as hedges)
 
 
 
 
 
Gains (losses) recognized in Aircraft fuel
$
(6
)
 
$
(3
)
 
$
(19
)
Interest rate swaps (designated as hedges)
 
 
 
 
 
Gains (losses) recognized in Aircraft rent
(5
)
 
(6
)
 
(6
)
Gains (losses) recognized in other comprehensive income (OCI)
1

 
8

 
(5
)