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Segment Information (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Document Period End Date |  |  | Sep. 30, 2016 |  |
Revenues | $ 2,656 | $ 2,577 | $ 6,780 | $ 6,600 |
Adjusted EBITDA | 469 | 431 | 717 | 775 |
Non Vehicle Related Depreciation And Amortization | 63 | 56 | 189 | 161 |
Restructuring expense | 6 | 6 | 26 | 10 |
Income before income taxes | 345 | 312 | 322 | 378 |
Assets Under Vehicle Programs | 12,797 |  | 12,797 |  | $ 11,716
International |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 835 | 801 | 2,002 | 1,893 |
Adjusted EBITDA | 179 | 168 | 237 | 245 |
Assets Under Vehicle Programs | 2,900 |  | 2,900 |  | 2,300
Americas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1,821 | 1,776 | 4,778 | 4,707 |
Adjusted EBITDA | 306 | 279 | 532 | 572 |
Assets Under Vehicle Programs | 2,300 |  | 2,300 |  | $ 1,900
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
Adjusted EBITDA | $ (16) | $ (16) | $ (52) | $ (42) |

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