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Acquisitions (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Goodwill | $ 964 | $ 842
Maggiore Group [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Business Acquisition, Date of Acquisition Agreement | Apr. 01, 2015 |
Business Combination, Consideration Transferred | $ 160 |
Goodwill | $ 79 |
Other intangibles, useful life, in years | 10 years |
Brazil [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Business Acquisition, Date of Acquisition Agreement | Apr. 01, 2015 |
Equity Method Investment, Additional Information | 0.5 |
Payments to Acquire Equity Method Investments | $ 8 |
Due to Related Parties | 46 |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss | 8 |
Goodwill | $ 75 |
Scandinavian Licensee [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Business Acquisition, Date of Acquisition Agreement | Jan. 01, 2015 |
Business Combination, Consideration Transferred | $ 39 |
Goodwill | 21 |
Non Cash Charge On Unfavorable License Rights Reacquired With Acquisition With Subsidiaries | 22 |
Budget Licensees [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [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
Customer Relationships [Member] | Maggiore Group [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Finite-lived Intangible Assets Acquired | 51 |
Customer Relationships [Member] | Budget Licensees [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Other intangibles, useful life, in years |  | 12 years
Finite-lived Intangible Assets Acquired |  | $ 10
Other Intangible Assets [Member] | Maggiore Group [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Finite-lived Intangible Assets Acquired | 34 |
License Agreements [Member] | Maggiore Group [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 11 |
License Agreements [Member] | Scandinavian Licensee [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Other intangibles, useful life, in years | 8 years |
Finite-lived Intangible Assets Acquired | $ 31 |
License Agreements [Member] | Budget Licensees [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Other intangibles, useful life, in years |  | 3 years
Finite-lived Intangible Assets Acquired |  | $ 48

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