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Leases (Lessor) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | $ 2,994 | $ 3,081 | $ 5,503 | $ 5,594
Avis |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 1,710 | 1,721 | 3,144 | 3,109
Budget |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 1,105 | 1,168 | 2,014 | 2,132
Other |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 179 | 192 | 345 | 353
Americas |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 2,330 | 2,410 | 4,304 | 4,405
Europe, Middle East and Africa |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 524 | 523 | 888 | 872
Asia and Australasia |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | $ 140 | $ 148 | $ 311 | $ 317

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