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Basis of Presentation Disaggregated Revenue in Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 1,920 | $ 1,968
Americas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,327 | 1,348
EMEA [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 433 | 447
Asia and Australasia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 160 | 173
Avis [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,100 | 1,145
Budget [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 651 | 642
Other Brands [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 169 | $ 181

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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