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Segment Information (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2018 |  |
Revenues | $ 2,328 | $ 2,238 | $ 4,296 | $ 4,077 |
Adjusted EBITDA | 161 | 140 | 163 | 113 |
Non Vehicle Related Depreciation And Amortization | 67 | 65 | 128 | 128 |
Restructuring and other related charges | 4 | 38 | 10 | 45 |
Income (loss) before income taxes | 38 | 11 | (91) | (154) |
Assets Under Vehicle Programs | 14,726 |  | 14,726 |  | $ 11,879
Total assets exclusive of assets under vehicle programs | 6,193 |  | 6,193 |  | 5,820
Americas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | 107 | 96 | 122 | 76 |
Assets Under Vehicle Programs | 11,000 |  | 11,000 |  | 9,000
International [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 738 | 673 | 1,358 | 1,198 |
Adjusted EBITDA | 71 | 59 | 74 | 66 |
Assets Under Vehicle Programs | 3,700 |  | 3,700 |  | $ 2,900
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
Adjusted EBITDA | $ (17) | $ (15) | $ (33) | $ (29) |

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