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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Rollforward of the Amounts Included in AOCI, Net of Taxes
A rollforward of the amounts included in AOCI, net of taxes, is shown below for 2015 and 2014:

(in millions)
Fuel derivatives
 
Interest rate derivatives
 
Defined benefit plan items
 
Other
 
Deferred tax impact
 
Accumulated other
comprehensive income (loss)
Balance at December 31, 2013
$
(20
)

$
(58
)

$
65


$
8


$
2

 
$
(3
)
Changes in fair value
(1,191
)

(10
)

(24
)

—


454

 
(771
)
Reclassification to earnings
34


23


—


—


(21)

 
36

Balance at December 31, 2014
$
(1,177
)

$
(45
)

$
41


$
8


$
435


$
(738
)
Changes in fair value
(867
)

(5
)

(19
)

(2
)

329

 
(564
)
Reclassification to earnings
378


20


—


—


(147)

 
251

Balance at December 31, 2015
$
(1,666
)

$
(30
)

$
22


$
6


$
617


$
(1,051
)
Reclassification out of Accumulated Other Comprehensive Income
The following table illustrates the significant amounts reclassified out of each component of AOCI for the year ended December 31, 2015:

Year ended December 31, 2015
(in millions)
 
Amounts reclassified from AOCI
 
Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components
 
 
Unrealized loss on fuel derivative instruments
 
$
378

 
Fuel and oil expense
 
 
140

 
Less: Tax expense
 
 
$
238

 
Net of tax
Unrealized loss on interest rate derivative instruments
 
$
20

 
Interest expense
 
 
7

 
Less: Tax expense
 
 
$
13

 
Net of tax
 
 
 
 
 
Total reclassifications for the period
 
$
251

 
Net of tax