v3.26.1
Segment Information - Schedule of Segment Assets (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]    
Property and equipment additions $ 109 $ 218
Assets exclusive of assets under vehicle programs 10,863 10,306
Assets under vehicle programs 21,465 20,951
Net long-lived assets 2,485 2,466
Americas    
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]    
Property and equipment additions 35 79
Assets exclusive of assets under vehicle programs 7,340 7,070
Assets under vehicle programs 17,099 17,312
Net long-lived assets 1,491 1,470
International    
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]    
Property and equipment additions 20 36
Assets exclusive of assets under vehicle programs 3,187 2,951
Assets under vehicle programs 4,366 3,639
Net long-lived assets 784 805
Unallocated Assets    
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]    
Property and equipment additions 54 103
Assets exclusive of assets under vehicle programs 336 285
Assets under vehicle programs 0 0
Net long-lived assets $ 210 $ 191