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Segment Information - Summary of Segment Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Reportable segment Adjusted EBITDA $ 202 $ 273 $ 246
Assets exclusive of assets under vehicle programs 9,668 9,590 8,499
Assets under vehicle programs 19,373 22,979 17,428
Net long-lived assets 2,369 2,488 2,330
Americas      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Reportable segment Adjusted EBITDA 109 126 117
Assets exclusive of assets under vehicle programs 6,785 6,533 5,798
Assets under vehicle programs 16,058 19,285 14,269
Net long-lived assets 1,474 1,483 1,446
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Reportable segment Adjusted EBITDA 40 44 33
Assets exclusive of assets under vehicle programs 2,539 2,633 2,402
Assets under vehicle programs 3,315 3,694 3,159
Net long-lived assets 733 795 761
Unallocated Assets (a)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Reportable segment Adjusted EBITDA 53 103 96
Assets exclusive of assets under vehicle programs 344 424 299
Assets under vehicle programs 0 0 0
Net long-lived assets $ 162 $ 210 $ 123