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Acquisitions - Additional Information (Detail) € in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Dec. 31, 2016 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 EUR (€)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Commitments and contingencies (Note 14) |  |  |  |  |  |  |  |
Transaction-related costs, net |  |  |  |  | 20 | 23 | $ 21 |
Goodwill |  | $ 1,007 |  |  | 1,092 | 1,073 | 1,007 |
Income (Loss) from Equity Method Investments |  |  |  |  | 0 | 0 | $ 0 |
Equity Method Investments |  |  |  |  | 0 | 0 |  |
2018 Avis and Budget Licensees [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  | $ 38 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 2 years |  |  |
2018 Avis and Budget Licensees [Member] | Licensing Agreements [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 42 |  |  |
Turiscar Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Oct. 01, 2018 |  |  |
Business Combination, Consideration Transferred |  |  |  |  | $ 25 |  |  |
Business Combination, Contingent Consideration, Liability | € |  |  |  |  |  |  |  | € 4
Payments to Acquire Businesses, Gross |  |  |  |  | $ 26 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 11 years |  |  |
Goodwill |  |  |  |  | $ 12 |  |  |
Turiscar Group [Member] | Other Intangible Assets [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 10 |  |  |
Turiscar Group [Member] | Trademarks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 2 |  |  |
Morini S.p.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Jul. 01, 2018 |  |  |
Business Combination, Consideration Transferred |  |  |  |  | $ 40 |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  | 6 |  |  | € 7
Payments to Acquire Businesses, Gross |  |  |  |  | $ 32 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 6 years |  |  |
Goodwill |  |  |  |  | $ 42 |  |  |
Morini S.p.A. [Member] | Other Intangible Assets [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 6 |  |  |
Morini S.p.A. [Member] | Trademarks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 3 |  |  |
Morini S.p.A. [Member] | Licensing Agreements [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 2 |  |  |
2017 Avis and Budget Licensees [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  |  |  |  |  | $ 9 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 3 years |  |
Transaction-related costs, net |  |  |  |  |  | $ 2 |  |
2017 Avis and Budget Licensees [Member] | Licensing Agreements [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  | 12 |  |
ACL Hire Limited [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Nov. 01, 2017 |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  | 5 |  |
Commitments and contingencies (Note 14) |  |  |  |  |  | 2 |  |
Goodwill |  |  |  |  |  | 6 |  |
France Cars [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Dec. 01, 2016 |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 45 |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  | 8 years |
Goodwill |  | $ 22 |  |  |  |  | $ 22 |
France Cars [Member] | Other Intangible Assets [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  | $ 9 |
France Cars [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  | $ 6 |  |
Greece [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Mar. 01, 2018 |  |  |
Equity Method Investment, Ownership Percentage |  |  | 20.00% | 20.00% | 40.00% |  |  | 40.00%
Payments to Acquire Equity Method Investments |  |  | $ 20 | $ 19 |  |  |  |
Equity Method Investments |  |  |  |  | $ 8 |  |  |

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