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Acquisitions (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |
Asset acquisition, consideration transferred | $ 10 |  | $ 14 | $ 23 |  |
Goodwill |  |  |  | 1,108 | $ 1,099 | $ 1,070
McNicoll Vehicle Hire |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, consideration transferred |  | $ 17 |  |  |  |
Goodwill |  | 10 |  |  |  |
Franchise Rights |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 14 | $ 28 |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 5 years | 1 year |  |
Trade Names | McNicoll Vehicle Hire |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 4 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 10 years |  |  |  |
Customer relationships | McNicoll Vehicle Hire |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 1 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 10 years |  |  |  |
License agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired | $ 10 |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 3 years |  |  |  |  |
Vehicle leases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property and equipment additions | $ 4 |  | $ 20 | $ 22 |  |

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- Definition Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479908/805-50-55-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480060/805-50-25-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480027/805-50-30-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480027/805-50-30-2 + Details
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