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Acquisitions and Other Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Goodwill | $ 1,064 |  |  | $ 1,064 |  | $ 1,073
Income (Loss) from Equity Method Investments | 0 |  | $ 0 | 0 | $ 0 |
2018 Avis and Budget Licensees [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 31 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 2 years |  |
Morini S.p.A. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 40 |  |
Business Combination, Contingent Consideration, Liability | 6 |  |  | 6 |  |
Payments to Acquire Businesses, Gross | 32 |  |  |  |  |
Goodwill | 21 |  |  | $ 21 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 14 years |  |
Greece [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 18 | $ 19 |  |  |  |
Equity Method Investment, Ownership Percentage | 40.00% | 20.00% |  | 40.00% |  |
Equity Method Investment, Commitment to Purchase Ownership Percentage |  | 20.00% |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  | $ 7 |  |
Commitment to Purchase within next 12 months [Member] | Greece [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Commitment to Purchase Ownership Percentage |  | 10.00% |  |  |  |
Commitment to Purchase in year 2 [Member] | Greece [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Commitment to Purchase Ownership Percentage |  | 10.00% |  |  |  |
Licensing Agreements [Member] | 2018 Avis and Budget Licensees [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 36 |  |
Licensing Agreements [Member] | Morini S.p.A. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 19 |  |
Customer Relationships [Member] | Morini S.p.A. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 3 |  |
Other Intangible Assets [Member] | Morini S.p.A. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | $ 3 |  |

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