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Segment Information (Schedule of Segment Assets) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | $ 136 | $ 202
Assets exclusive of assets under vehicle programs | 10,780 | 9,668
Assets under vehicle programs | 21,738 | 19,373
Net long-lived assets | 2,431 | 2,369
Americas |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | 44 | 109
Assets exclusive of assets under vehicle programs | 7,394 | 6,785
Assets under vehicle programs | 17,504 | 16,058
Net long-lived assets | 1,438 | 1,474
International |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | 23 | 40
Assets exclusive of assets under vehicle programs | 3,066 | 2,539
Assets under vehicle programs | 4,234 | 3,315
Net long-lived assets | 793 | 733
Unallocated Assets |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | 69 | 53
Assets exclusive of assets under vehicle programs | 320 | 344
Assets under vehicle programs | 0 | 0
Net long-lived assets | $ 200 | $ 162

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