Leases - Schedule of Revenues Disaggregated by Geography (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | $ 2,946 | $ 2,989 | $ 5,430 | $ 5,374 |
| Operating lease, lease income, statement of income or comprehensive income [extensible enumeration] | Revenues | Revenues | ||
| Avis | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | 1,682 | 1,687 | $ 3,082 | $ 3,032 |
| Budget | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | 1,123 | 1,120 | 2,063 | 1,994 |
| Other | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | 141 | 182 | 285 | 348 |
| Americas | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | 2,265 | 2,308 | 4,206 | 4,193 |
| Europe, Middle East and Africa | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | 527 | 543 | 882 | 885 |
| Asia and Australasia | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Total lease revenues | $ 154 | $ 138 | $ 342 | $ 296 |