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Accumulated Other Comprehensive Income (Loss) (Notes) | 3 Months Ended
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Mar. 31, 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 March 31, 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 tax benefit $1 | 3 |  |  | 3 |
Change in fair value, net of tax benefit $4 | (11 | ) |  | (11 | )
Balance of accumulated (loss), at March 31, 2020 | $ | (6 | ) |  | $ | (6 | )
Balance of accumulated (loss), at December 31, 2018 | $ | (3 | ) |  | $ | (3 | )
Reclassifications into earnings, net of tax benefit of $0 | 2 |  |  | 2 |
Change in fair value, net of tax benefit of $0 | — |  |  | — |
Balance of accumulated (loss), at March 31, 2019 | $ | (1 | ) |  | $ | (1 | )
(1) Reclassified to aircraft fuel expense. (2) In March 2020, 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 of occurring. Losses of $2 million that were previously deferred were reclassified to interest income and other during the three months ended March 31, 2020.

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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 + Details
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