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Summary of Segments Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net revenues | $ 8,848 | $ 8,659 | $ 8,502
Vehicle depreciation and lease charges, net | 2,221 | 2,047 | 1,933
Vehicle interest, net | (286) | (284) | (289)
Adjusted EBITDA | 735 | 838 | 903
Non-vehicle depreciation and amortization | 259 | 253 | 218
Assets exclusive of assets under vehicle programs | 5,820 | 6,065 | 5,918
Assets under vehicle programs | 11,879 | 11,578 | 11,716
Capital expenditures (excluding vehicles) | 197 | 190 | 199
Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 6,100 | 6,121 | 6,069
Vehicle depreciation and lease charges, net | 1,671 | 1,559 | 1,478
Vehicle interest, net | (226) | (226) | (234)
Adjusted EBITDA | 486 | 633 | 682
Non-vehicle depreciation and amortization | 168 | 165 | 143
Assets exclusive of assets under vehicle programs | 3,388 | 4,017 | 3,940
Assets under vehicle programs | 9,017 | 9,210 | 9,440
Capital expenditures (excluding vehicles) | 122 | 121 | 131
International |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 2,748 | 2,538 | 2,433
Vehicle depreciation and lease charges, net | 550 | 488 | 455
Vehicle interest, net | (60) | (58) | (55)
Adjusted EBITDA | 305 | 273 | 277
Non-vehicle depreciation and amortization | 91 | 88 | 75
Assets exclusive of assets under vehicle programs | 2,353 | 1,990 | 1,901
Assets under vehicle programs | 2,862 | 2,368 | 2,276
Capital expenditures (excluding vehicles) | 62 | 62 | 68
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Adjusted EBITDA | (56) | (68) | (56)
Assets exclusive of assets under vehicle programs | 79 | 58 | 77
Capital expenditures (excluding vehicles) | 13 | 7 |
Acquisition-related Costs [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Non-vehicle depreciation and amortization | $ 58 | $ 59 | $ 55

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