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Leases (Lessor) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | $ 2,513 | $ 2,398
Avis |  |
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | 1,388 | 1,261
Budget |  |
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | 964 | 972
Other |  |
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | 161 | 165
Americas |  |
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | 1,995 | 1,985
Europe, Middle East and Africa |  |
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | 349 | 309
Asia and Australasia |  |
Lessor, Lease, Description [Line Items] |  |
Total lease revenues | $ 169 | $ 104

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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI https://asc.fasb.org/extlink&oid=126900988&loc=SL77927221-108306 + Details
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