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Summary of Geographic Segment 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
Revenues from External Customers and Long-Lived Assets [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
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
Long-Lived Assets | 2,653 |  |  |  | 2,627 |  |  |  | 2,653 | 2,627 | 2,562
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,708 | 5,629 | 5,674
Assets exclusive of assets under vehicle programs | 3,494 |  |  |  | 3,069 |  |  |  | 3,494 | 3,069 | 3,699
Assets under vehicle programs | 9,021 |  |  |  | 8,192 |  |  |  | 9,021 | 8,192 | 8,552
Long-Lived Assets | 1,476 |  |  |  | 1,451 |  |  |  | 1,476 | 1,451 | 1,489
All Other Countries |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,416 | 3,219 | 2,985
Assets exclusive of assets under vehicle programs | 2,876 |  |  |  | 2,751 |  |  |  | 2,876 | 2,751 | 2,366
Assets under vehicle programs | 3,758 |  |  |  | 3,687 |  |  |  | 3,758 | 3,687 | 3,026
Long-Lived Assets | $ 1,177 |  |  |  | $ 1,176 |  |  |  | $ 1,177 | $ 1,176 | $ 1,073

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