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Accumulated Other Comprehensive Income (Loss) (Notes) | 9 Months Ended
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Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Comprehensive Income (Loss) Note [Text Block] | Accumulated Other Comprehensive Income (Loss) Comprehensive income (loss) includes changes in fair value of our aircraft fuel derivatives which qualify for hedge accounting. A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the three months ended September 30, 2020 and 2019 is as follows (in millions):
| Aircraft Fuel Derivatives(1)(2) |  | Total
Balance of accumulated (loss), at June 30, 2020 | $ | (3 | ) |  | $ | (3 | )
Reclassifications into earnings, net of deferred taxes of $(1) | 1 |  |  | 1 |
Change in fair value, net of deferred taxes of $0 | — |  |  | — |
Balance of accumulated (loss), at September 30, 2020 | $ | (2 | ) |  | $ | (2 | )
Balance of accumulated income at June 30, 2019 | $ | 1 |  |  | $ | 1 |
Reclassifications into earnings, net of deferred taxes of $0 | — |  |  | — |
Change in fair value, net of deferred taxes of $0 | (2 | ) |  | (2 | )
Balance of accumulated (loss) at September 30, 2019 | $ | (1 | ) |  | $ | (1 | )
A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the nine months ended September 30, 2020 and 2019 is as follows (in millions):
| Aircraft Fuel Derivatives(1)(2) |  | Total
Balance of accumulated income, at December 31, 2019 | $ | 2 |  |  | $ | 2 |
Reclassifications into earnings, net of deferred taxes of $(4) | 7 |  |  | 7 |
Change in fair value, net of deferred taxes of $5 | (11 | ) |  | (11 | )
Balance of accumulated (loss), at September 30, 2020 | $ | (2 | ) |  | $ | (2 | )
Balance of accumulated (loss), at December 31, 2018 | $ | (3 | ) |  | $ | (3 | )
Reclassifications into earnings, net of deferred taxes $(1) | 3 |  |  | 3 |
Change in fair value, net of deferred taxes of $0 | (1 | ) |  | (1 | )
Balance of accumulated (loss), at September 30, 2019 | $ | (1 | ) |  | $ | (1 | )
(1) Reclassified to aircraft fuel expense. (2) We made several capacity reductions in response to the COVID-19 pandemic. These capacity reductions led to the discontinuance of hedge accounting on a number of our aircraft fuel derivatives as the forecasted consumption of aircraft fuel was no longer probable. Losses of $1 million and $5 million that were previously deferred in other comprehensive loss were reclassified to interest income and other during the three and nine months ended September 30, 2020, respectively.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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