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Accumulated Other Comprehensive (Income) Loss (Tables)
 12 Months Ended
Dec. 31, 2019
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 2019 and 2018:

(in millions)
Fuel derivatives
 
Interest rate derivatives
 
Defined benefit plan items
 
Other
 
Deferred tax impact
 
Accumulated other
comprehensive income (loss)
Balance at December 31, 2017
$
3


$
(7
)

$
(9
)

$
33


$
(8
)
 
$
12

ASU 2017-12 adoption adjustment (a)
(26
)
 
—

 
—

 
—

 
6

 
(20
)
ASU 2018-02 stranded AOCI adoption adjustment (b)
—

 
—

 
—

 
—

 
2

 
2

Changes in fair value
—


1


67


(8
)

(14
)
 
46

Reclassification to earnings
(33
)

6


—


—


7

 
(20
)
Balance at December 31, 2018
$
(56
)

$
—


$
58


$
25


$
(7
)

$
20

Changes in fair value
(117
)

(38
)

(38
)

34


37

 
(122
)
Reclassification to earnings
48


5


—


—


(12
)
 
41

Balance at December 31, 2019
$
(125
)

$
(33
)

$
20


$
59


$
18


$
(61
)


(a) The Company adopted the New Hedging Standard as of January 1, 2018. See Note 2 for further information on this adoption.
(b) The Company adopted the Reclassification of Certain Tax Effects from AOCI as of January 1, 2018, which allowed the Company to reclassify to Retained earnings any tax effects stranded in AOCI as a result of the Tax Cuts and Jobs Act enacted in December 2017.
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, 2019:

Year ended December 31, 2019
(in millions)
 
Amounts reclassified from AOCI
 
Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components
 
 
Unrealized loss on fuel derivative instruments
 
$
48

 
Fuel and oil expense
 
 
11

 
Less: Tax expense
 
 
$
37

 
Net of tax
Unrealized loss on interest rate derivative instruments
 
$
5

 
Interest expense
 
 
1

 
Less: Tax expense
 
 
$
4

 
Net of tax
 
 
 
 
 
Total reclassifications for the period
 
$
41

 
Net of tax