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Segment Information (Summary of Segment Assets) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | $ 34 | $ 202
Assets exclusive of assets under vehicle programs | 9,830 | 9,668
Assets under vehicle programs | 19,214 | 19,373
Net long-lived assets | 2,375 | 2,369
Americas |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | 14 | 109
Assets exclusive of assets under vehicle programs | 6,876 | 6,785
Assets under vehicle programs | 15,851 | 16,058
Net long-lived assets | 1,458 | 1,474
International |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | 6 | 40
Assets exclusive of assets under vehicle programs | 2,608 | 2,539
Assets under vehicle programs | 3,363 | 3,315
Net long-lived assets | 753 | 733
Unallocated Assets |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property and equipment additions | 14 | 53
Assets exclusive of assets under vehicle programs | 346 | 344
Assets under vehicle programs | 0 | 0
Net long-lived assets | $ 164 | $ 162

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