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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 3,337 | $ 3,563
Reclassifications into earnings, net of taxes | 2 | (1)
Change in fair value, net of taxes | 1 | (4)
Ending balance | 2,633 | 3,373
Reclassification into earnings, tax | 0 | 0
Change in fair value, tax | 0 | (1)
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (4) | 0
Ending balance | (1) | (5)
Aircraft fuel derivatives (1) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (3) | 1
Reclassifications into earnings, net of taxes | 2 | (1)
Change in fair value, net of taxes | 1 | (4)
Ending balance | 0 | (4)
Available-for-sale securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (1) | (1)
Reclassifications into earnings, net of taxes | 0 | 0
Change in fair value, net of taxes | 0 | 0
Ending balance | $ (1) | $ (1)

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- Definition Other Comprehensive Income (Loss), Debt Securities, Available-for-Sale And Cash Flow Hedge, Gain (Loss), Before Reclassification and After Tax, Parent + References No definition available. + Details
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- Definition Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 + Details
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