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Operating Leases - Lease Extension (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Lessee, Lease, Description [Line Items] |  |  |  |
Aircraft rent expense (benefit) | $ (147) | $ (148) | $ (306) | $ (279)
Aircraft |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Aircraft rent expense (benefit) | $ 11 |  | $ 14 | $ 18

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- Details
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