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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
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 2017 and 2016:

(in millions)
Fuel derivatives
 
Interest rate derivatives
 
Defined benefit plan items
 
Other
 
Deferred tax impact
 
Accumulated other
comprehensive income (loss)
Balance at December 31, 2015
$
(1,666
)

$
(30
)

$
22


$
6


$
617

 
$
(1,051
)
Changes in fair value
194


(3
)

(36
)

14


(63
)
 
106

Reclassification to earnings
973


15


—


—


(366
)
 
622

Balance at December 31, 2016
$
(499
)

$
(18
)

$
(14
)

$
20


$
188


$
(323
)
Changes in fair value
(50
)

—


5


13


11

 
(21
)
Reclassification to earnings
552


11


—


—


(207
)
 
356

Balance at December 31, 2017
$
3


$
(7
)

$
(9
)

$
33


$
(8
)

$
12
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, 2017:

Year ended December 31, 2017
(in millions)
 
Amounts reclassified from AOCI
 
Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components
 
 
Unrealized loss on fuel derivative instruments
 
$
552

 
Fuel and oil expense
 
 
203

 
Less: Tax expense
 
 
$
349

 
Net of tax
Unrealized loss on interest rate derivative instruments
 
$
11

 
Interest expense
 
 
4

 
Less: Tax expense
 
 
$
7

 
Net of tax
 
 
 
 
 
Total reclassifications for the period
 
$
356

 
Net of tax