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Summary of Segments Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,050 | $ 2,778 | $ 2,328 | $ 1,968 | $ 2,019 | $ 2,752 | $ 2,238 | $ 1,839 | $ 9,124 | $ 8,848 | $ 8,659
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 2,179 | 2,221 | 2,047
Vehicle interest, net |  |  |  |  |  |  |  |  | (314) | (286) | (284)
Adjusted EBITDA |  |  |  |  |  |  |  |  | 781 | 735 | 838
Non-vehicle depreciation and amortization |  |  |  |  |  |  |  |  | 256 | 259 | 253
Assets exclusive of assets under vehicle programs | 6,370 |  |  |  | 5,820 |  |  |  | 6,370 | 5,820 | 6,065
Assets under vehicle programs | 12,779 |  |  |  | 11,879 |  |  |  | 12,779 | 11,879 | 11,578
Capital expenditures (excluding vehicles) |  |  |  |  |  |  |  |  | 231 | 197 | 190
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,186 | 6,100 | 6,121
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 1,568 | 1,671 | 1,559
Vehicle interest, net |  |  |  |  |  |  |  |  | (252) | (226) | (226)
Adjusted EBITDA |  |  |  |  |  |  |  |  | 558 | 486 | 633
Non-vehicle depreciation and amortization |  |  |  |  |  |  |  |  | 152 | 168 | 165
Assets exclusive of assets under vehicle programs | 3,782 |  |  |  | 3,388 |  |  |  | 3,782 | 3,388 | 4,017
Assets under vehicle programs | 9,670 |  |  |  | 9,017 |  |  |  | 9,670 | 9,017 | 9,210
Capital expenditures (excluding vehicles) |  |  |  |  |  |  |  |  | 134 | 122 | 121
International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,938 | 2,748 | 2,538
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 611 | 550 | 488
Vehicle interest, net |  |  |  |  |  |  |  |  | (62) | (60) | (58)
Adjusted EBITDA |  |  |  |  |  |  |  |  | 287 | 305 | 273
Non-vehicle depreciation and amortization |  |  |  |  |  |  |  |  | 104 | 91 | 88
Assets exclusive of assets under vehicle programs | 2,495 |  |  |  | 2,353 |  |  |  | 2,495 | 2,353 | 1,990
Assets under vehicle programs | 3,109 |  |  |  | 2,862 |  |  |  | 3,109 | 2,862 | 2,368
Capital expenditures (excluding vehicles) |  |  |  |  |  |  |  |  | 76 | 62 | 62
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  | (64) | (56) | (68)
Assets exclusive of assets under vehicle programs | $ 93 |  |  |  | $ 79 |  |  |  | 93 | 79 | 58
Capital expenditures (excluding vehicles) |  |  |  |  |  |  |  |  | 21 | 13 | 7
Acquisition-related Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vehicle depreciation and amortization |  |  |  |  |  |  |  |  | $ 61 | $ 58 | $ 59

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- Definition Adjusted earnings before non-vehicle related depreciation and amortization, any impairment charge, restructuring and other related charges, early extinguishment of debt costs, non-vehicle related interest, transaction-related costs, net charges for an unprecedented personal-injury legal matters, non-operational charges related to shareholder activist activity and income taxes. + References No definition available. + Details
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