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Basis of Presentation Disaggregated Revenue in Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Other related Revenue | $ 30 | $ 40 | $ 84 | $ 103
Revenues | 1,534 | 2,753 | 4,047 | 7,010
Corporate Interest Expense [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 3 | 0 | 4 | 2
Americas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,114 | 1,868 | 2,936 | 4,822
EMEA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 363 | 742 | 879 | 1,747
Asia and Australasia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57 | 143 | 232 | 441
Avis [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 843 | 1,580 | 2,230 | 4,008
Budget [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 539 | 950 | 1,425 | 2,417
Other Brands [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 152 | $ 223 | $ 392 | $ 585

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