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Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Components of Comprehensive Income
The differences between Net income and Comprehensive income for the three months ended March 31, 2018 and 2017 were as follows:

 
Three months ended March 31,
(in millions)
2018
 
2017
NET INCOME
$
463

 
$
339

Unrealized gain on fuel derivative instruments, net of
  deferred taxes of $25 and $5
81

 
9

Unrealized gain on interest rate derivative instruments, net of
  deferred taxes of $- and $1
3

 
2

Total other comprehensive income
$
84

 
$
11

COMPREHENSIVE INCOME
$
547

 
$
350
Rollforward of the Amounts Included in AOCI, Net of Taxes
A rollforward of the amounts included in AOCI is shown below for the three months ended March 31, 2018:
(in millions)
Fuel derivatives
 
Interest rate derivatives
 
Defined benefit plan items
 
Other
 
Deferred tax
 
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
102

 
1

 
—

 
—

 
(24
)
 
79

Reclassification to earnings
4

 
2

 
—

 
—

 
(1
)
 
5

Balance at March 31, 2018
$
83

 
$
(4
)
 
$
(9
)
 
$
33

 
$
(25
)
 
$
78

(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. See Note 2 for further information on this adoption.
Reclassification out of Accumulated Other Comprehensive Income
The following table illustrates the significant amounts reclassified out of each component of AOCI for the three months ended March 31, 2018:

Three months ended March 31, 2018
(in millions)
 
Amounts reclassified from AOCI
 
Affected line item in the unaudited Condensed Consolidated Statement of
Comprehensive Income
AOCI components
 
 
Unrealized loss on fuel derivative instruments
 
$
4

 
Fuel and oil expense
 
 
1

 
Less: Tax expense
 
 
$
3

 
Net of tax
Unrealized loss on interest rate derivative instruments
 
$
2

 
Interest expense
 
 
—

 
Less: Tax expense
 
 
$
2

 
Net of tax
 
 
 
 
 
Total reclassifications for the period
 
$
5

 
Net of tax