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Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Accumulated other comprehensive income (loss), net of taxes
Comprehensive income (loss) includes changes in fair value of our aircraft fuel derivatives which qualify for hedge accounting. A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the years ended December 31, 2019, 2018, and 2017 is as follows (in millions):
 
 
Aircraft Fuel Derivatives(1)
 
Total
Balance of accumulated income, at December 31, 2016
 
$
13

 
$
13

Reclassifications into earnings, net of tax benefit of $6
 
(9
)
 
(9
)
Change in fair value, net of tax benefit of $2
 
(4
)
 
(4
)
Balance of accumulated income, at December 31, 2017
 
—

 
—

Reclassifications into earnings, net of tax benefit of $0
 
1

 
1

Change in fair value, net of tax benefit of $2
 
(4
)
 
(4
)
Balance of accumulated (losses), at December 31, 2018
 
(3
)
 
(3
)
Reclassifications into earnings, net of tax (expense) of $(1)
 
4

 
4

Change in fair value, net of tax benefit of $0
 
1

 
1

Balance of accumulated income, at December 31, 2019
 
$
2

 
$
2



(1)
Reclassified to aircraft fuel expense.