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Acquisitions (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Goodwill | $ 1,083 | $ 1,092
2019 Avis and Budget Licensees [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | 21 |
2019 Avis and Budget Licensees [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Consideration Transferred, Other | 40 |
Business Acquisition Purchase Price Allocation Vehicles, Net | 27 |
Payments to Acquire Businesses, Gross | 64 |
Business Combination, Contingent Consideration, Liability | $ 3 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |
Customer relationships [Member] | 2019 Avis and Budget Licensees [Member] |  |
Business Acquisition [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 7 |
Licensing Agreements | 2019 Avis and Budget Licensees [Member] |  |
Business Acquisition [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 12 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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