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Comprehensive Income (Loss) (Tables)
9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Components of Comprehensive Income (Loss) The differences between Net income (loss) and Comprehensive income (loss) for the three and nine months ended September 30, 2020 and 2019 were as follows:
 Three months ended September 30,
(in millions)20202019
NET INCOME (LOSS)$(1,157)$659 
Unrealized gain (loss) on fuel derivative instruments, net of
  deferred taxes of $5 and $(24)
14 (80)
Unrealized gain (loss) on interest rate derivative instruments, net of
  deferred taxes of $— and $(5)
(15)
Other, net of deferred taxes of $3 and $—
11 
Total other comprehensive income (loss)$28 $(93)
COMPREHENSIVE INCOME (LOSS)$(1,129)$566 
 Nine months ended September 30,
(in millions)20202019
NET INCOME (LOSS)$(2,166)$1,787 
Unrealized gain (loss) on fuel derivative instruments, net of
  deferred taxes of $(6) and $(18)
(20)(61)
Unrealized loss on interest rate derivative instruments, net of
  deferred taxes of $(9) and $(13)
(29)(40)
Other, net of deferred taxes of $2 and $4
18 
Total other comprehensive loss$(41)$(83)
COMPREHENSIVE INCOME (LOSS)$(2,207)$1,704 
Rollforward of the Amounts Included in AOCI, Net of Taxes
A rollforward of the amounts included in AOCI is shown below for the three and nine months ended September 30, 2020:
(in millions)Fuel derivativesInterest rate derivativesDefined benefit plan itemsOtherDeferred taxAccumulated other comprehensive income (loss)
Balance at June 30, 2020$(170)$(74)$20 $55 $39 $(130)
Changes in fair value(21)— 14 (3)
Reclassification to earnings40 — — — (9)31 
Balance at September 30, 2020$(151)$(71)$20 $69 $31 $(102)


(in millions)Fuel derivativesInterest rate derivativesDefined benefit plan itemsOtherDeferred taxAccumulated other comprehensive income (loss)
Balance at December 31, 2019$(125)$(33)$20 $59 $18 $(61)
Changes in fair value(118)(39)— 10 34 (113)
Reclassification to earnings92 — — (21)72 
Balance at September 30, 2020$(151)$(71)$20 $69 $31 $(102)
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, 2020:
Three months ended September 30, 2020
(in millions)Amounts reclassified from AOCIAffected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss)
AOCI components
Unrealized loss on fuel derivative instruments$18 Fuel and oil expense
22 Other (gains) losses, net
Less: Tax expense
Total reclassifications for the period$31 Net of tax

Nine months ended September 30, 2020
(in millions)Amounts reclassified from AOCIAffected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss)
AOCI components
Unrealized loss on fuel derivative instruments$54 Fuel and oil expense
38 Other (gains) losses, net
21 Less: Tax expense
$71 Net of tax
Unrealized loss on interest rate derivative instruments$Interest expense
— Less: Tax expense
$Net of tax
Total reclassifications for the period$72 Net of tax