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Acquisitions - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,101 | $ 1,092 |  | $ 1,073
2019 Avis and Budget Licensees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | 55 |  |  |
Business Acquisition Purchase Price Allocation Vehicles, Net | 27 |  |  |
Business Combination, Contingent Consideration, Liability | 8 |  |  |
Payments to Acquire Businesses, Gross | $ 74 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |  |  |
Goodwill | $ 21 |  |  |
2019 Avis and Budget Licensees [Member] | Other Intangible Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 7 |  |  |
2019 Avis and Budget Licensees [Member] | Licensing Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | $ 24 |  |  |
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 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 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 |  |

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