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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated other comprehensive income (loss), net of taxes |  |  |
Beginning balance | $ 3,337 | $ 3,563 | $ 3,849
Reclassifications into earnings, net of tax | 7 | (6) | 4
Change in fair value | (1) | 2 | (4)
Ending balance | 2,641 | 3,337 | 3,563
Reclassifications into earnings, tax | 2 | 2 | (3)
Change in fair value, tax | (1) | 0 | 2
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated other comprehensive income (loss), net of taxes |  |  |
Beginning balance | (4) | 0 | 0
Ending balance | 2 | (4) | 0
Aircraft Fuel Derivatives |  |  |
Accumulated other comprehensive income (loss), net of taxes |  |  |
Beginning balance | (3) | 1 | 0
Reclassifications into earnings, net of tax | 8 | (5) | 4
Change in fair value | (5) | 1 | (3)
Ending balance | 0 | (3) | 1
Available-for-sale securities |  |  |
Accumulated other comprehensive income (loss), net of taxes |  |  |
Beginning balance | (1) | (1) | 0
Reclassifications into earnings, net of tax | (1) | (1) | 0
Change in fair value | 4 | 1 | (1)
Ending balance | $ 2 | $ (1) | $ (1)

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- Definition Amount, after tax and reclassification, of gain (loss) from 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 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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