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Basis of Presentation Disaggregated Revenue in Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Other related Revenue | $ 32 | $ 30
Revenues | 1,753 | 1,920
Americas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,257 | 1,327
EMEA [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 357 | 433
Asia and Australasia [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 139 | 160
Avis [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 985 | 1,100
Budget [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 619 | 651
Other Brands [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 149 | $ 169

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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://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 3: 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 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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=116634182&loc=SL114868664-224227 + Details
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