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Accumulated Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Dec. 31, 2020
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 2020 and 2019:
(in millions)Fuel derivativesInterest rate derivativesDefined benefit plan itemsOtherDeferred tax impactAccumulated other
comprehensive income (loss)
Balance at December 31, 2018$(56)$— $58 $25 $(7)$20 
Changes in fair value(117)(38)(38)34 37 (122)
Reclassification to earnings48 — — (12)41 
Balance at December 31, 2019$(125)$(33)$20 $59 $18 $(61)
Changes in fair value(103)(34)(63)32 39 (129)
Reclassification to earnings109 — — (25)85 
Balance at December 31, 2020$(119)$(66)$(43)$91 $32 $(105)
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, 2020:

Year ended December 31, 2020
(in millions)Amounts reclassified from AOCIAffected line item in the Consolidated Statement of Comprehensive Income (Loss)
AOCI components
Unrealized loss on fuel derivative instruments$70 Fuel and oil expense
39 Other (gains) losses, net
25 Less: Tax expense
$84 Net of tax
Unrealized loss on interest rate derivative instruments$Interest expense
— Less: Tax expense
$Net of tax
Total reclassifications for the period$85 Net of tax