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Leases (Lessor) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | $ 3,392 | $ 3,511 | $ 8,895 | $ 9,105
Avis |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 1,953 | 2,011 | 5,097 | 5,120
Budget |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 1,247 | 1,298 | 3,261 | 3,430
Other |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 192 | 202 | 537 | 555
Americas |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 2,587 | 2,715 | 6,891 | 7,120
Europe, Middle East and Africa |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 660 | 646 | 1,548 | 1,518
Asia and Australasia |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | $ 145 | $ 150 | $ 456 | $ 467

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