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Basis of Presentation Disaggregated Revenue in Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Other related Revenue | $ 22 | $ 33 | $ 54 | $ 63
Revenues | 760 | 2,337 | 2,513 | 4,257
Corporate Interest Expense [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 1 | 1 | 1 | 2
Americas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 565 | 1,627 | 1,822 | 2,954
EMEA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 159 | 572 | 516 | 1,005
Asia and Australasia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36 | 138 | 175 | 298
Avis [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 402 | 1,328 | 1,387 | 2,428
Budget [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 267 | 816 | 886 | 1,467
Other Brands [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 91 | $ 193 | $ 240 | $ 362

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