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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 973 | $ 842 | $ 691
Equity Method Investments |  | $ 0 | 0 |
Maggiore Group [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Apr. 01, 2015 |  |
Business Combination, Consideration Transferred |  | $ 160 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |  |
Goodwill |  | $ 88 |  |
Maggiore Group [Member] | Other Intangible Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 34 |  |
Maggiore Group [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 50 |  |
Maggiore Group [Member] | Licensing Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 11 |  |
Brazil [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Effective Date of Acquisition | Aug. 01, 2013 |  |  |
Business Combination, Consideration Transferred |  |  | 6 |
Goodwill |  | 77 |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Payments to Acquire Equity Method Investments | $ 53 | 8 |  | $ 47
Due to Related Parties |  | 46 |  |
Equity Method Investments |  |  | 12 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  | 33 |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss |  | 8 |  |
Avis and Budget Licensees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred |  | 62 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 23 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 8 years |  |
Goodwill |  | $ 29 |  |
Non Cash Charge On Unfavorable License Rights Reacquired With Acquisition With Subsidiaries |  | 25 |  |
Avis and Budget Licensees [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 12 |  |
Avis and Budget Licensees [Member] | Licensing Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 36 |  |
Budget Licensees [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred |  |  | 263 |
Business Acquisition Purchase Price Allocation Vehicles Net |  |  | 132 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | 58 |
Goodwill |  |  | 192 |
Non Cash Charge On Unfavorable License Rights Reacquired With Acquisition With Subsidiaries |  |  | 20 |
Budget Licensees [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 10 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 12 years |
Budget Licensees [Member] | Licensing Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 48 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 3 years |
Payless |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangibles, useful life, in years |  |  |  | 15 years
Business Acquisition, Effective Date of Acquisition |  |  |  | Jul. 01, 2013
Business Combination, Consideration Transferred |  |  |  | $ 46
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | 23
Indefinite-Lived Trademarks |  |  |  | 16
Goodwill |  |  |  | 27
Payless | Licensing Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-Lived License Agreements |  |  |  | $ 7
Zipcar |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangibles, useful life, in years |  |  |  | 8 years
Business Acquisition, Effective Date of Acquisition |  |  |  | Mar. 01, 2013
Business Combination, Consideration Transferred |  |  |  | $ 473
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | 188
Indefinite-Lived Trademarks |  |  |  | 112
Goodwill |  |  |  | 269
Zipcar | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-Lived Customer Relationships, Gross |  |  |  | $ 76

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