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Leases (Lessor) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | $ 3,081 | $ 3,202 | $ 5,594 | $ 5,600
Avis |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 1,721 | 1,728 | 3,109 | 2,989
Budget |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 1,168 | 1,270 | 2,132 | 2,242
Other |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 192 | 204 | 353 | 369
Americas |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 2,410 | 2,549 | 4,405 | 4,534
Europe, Middle East and Africa |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | 523 | 505 | 872 | 814
Asia and Australasia |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Total lease revenues | $ 148 | $ 148 | $ 317 | $ 252

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