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Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of Comprehensive Income (Loss) The differences between Net income and Comprehensive income (loss) for the three and nine months ended September 30, 2023 and 2022 were as follows:
 Three months ended September 30,
(in millions)20232022
NET INCOME$193 $277 
Unrealized gain (loss) on fuel derivative instruments, net of
  deferred taxes of $41 and ($153)
135 (504)
Unrealized gain on interest rate derivative instruments, net of
  deferred taxes of $2 and $—
8 4 
Total other comprehensive income (loss)$143 $(500)
COMPREHENSIVE INCOME (LOSS)$336 $(223)

 Nine months ended September 30,
(in millions)20232022
NET INCOME$717 $759 
Unrealized loss on fuel derivative instruments, net of
  deferred taxes of ($45) and ($31)
(150)(101)
Unrealized gain on interest rate derivative instruments, net of
  deferred taxes of $2 and $5
11 18 
Other, net of deferred taxes of $4 and $—
(4)— 
Total other comprehensive loss$(143)$(83)
COMPREHENSIVE INCOME$574 $676 
Rollforward of the Amounts Included in AOCI, Net of Taxes
A rollforward of the amounts included in AOCI, net of taxes, is shown below for the three and nine months ended September 30, 2023:
(in millions)Fuel derivativesInterest rate derivativesDefined benefit plan itemsDeferred tax impactAccumulated other comprehensive income (loss)
Balance at June 30, 2023$(65)$(29)$170 $(18)$58 
Changes in fair value228 8 — (55)181 
Reclassification to earnings(52)2 — 12 (38)
Balance at September 30, 2023$111 $(19)$170 $(61)$201 

(in millions)Fuel derivativesInterest rate derivativesDefined benefit plan itemsDeferred tax impactAccumulated other comprehensive income (loss)
Balance at December 31, 2022$305 $(32)$170 $(99)$344 
Changes in fair value(101)8 — 21 (72)
Reclassification to earnings(93)5 — 17 (71)
Balance at September 30, 2023$111 $(19)$170 $(61)$201 
Reclassification out of Accumulated Other Comprehensive Income (Loss)
The following tables illustrate the significant amounts reclassified out of each component of AOCI for the three and nine months ended September 30, 2023:
Three months ended September 30, 2023
(in millions)Amounts reclassified from AOCI
Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss)
AOCI components
Unrealized (gain) on fuel derivative instruments$(52)Fuel and oil expense
(12)Less: Tax expense
$(40)Net of tax
Unrealized loss on interest rate derivative instruments$2 Other operating expenses
— Less: Tax expense
$2 Net of tax
Total reclassifications for the period$(38)Net of tax

Nine months ended September 30, 2023
(in millions)Amounts reclassified from AOCI
Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss)
AOCI components
Unrealized (gain) on fuel derivative instruments$(93)Fuel and oil expense
(22)Less: Tax expense
$(71)Net of tax
Unrealized loss on interest rate derivative instruments$5 Other operating expenses
1 Less: Tax expense
$4 Net of tax
Other— Other
4 Less: Tax Expense
$(4)Net of tax
Total reclassifications for the period$(71)Net of tax