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Summary of Geographic Segment Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,162 | $ 2,753 | $ 2,337 | $ 1,920 | $ 2,050 | $ 2,778 | $ 2,328 | $ 1,968 | $ 9,172 | $ 9,124 | $ 8,848
Assets exclusive of assets under vehicle programs | 9,311 |  |  |  | 6,370 |  |  |  | 9,311 | 6,370 | 5,820
Assets under vehicle programs | 13,815 |  |  |  | 12,779 |  |  |  | 13,815 | 12,779 | 11,879
Long-Lived Assets | 2,691 |  |  |  | 2,653 |  |  |  | 2,691 | 2,653 | 2,627
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,867 | 5,708 | 5,629
Assets exclusive of assets under vehicle programs | 5,830 |  |  |  | 3,494 |  |  |  | 5,830 | 3,494 | 3,069
Assets under vehicle programs | 9,824 |  |  |  | 9,021 |  |  |  | 9,824 | 9,021 | 8,192
Long-Lived Assets | 1,536 |  |  |  | 1,476 |  |  |  | 1,536 | 1,476 | 1,451
All Other Countries |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,305 | 3,416 | 3,219
Assets exclusive of assets under vehicle programs | 3,481 |  |  |  | 2,876 |  |  |  | 3,481 | 2,876 | 2,751
Assets under vehicle programs | 3,991 |  |  |  | 3,758 |  |  |  | 3,991 | 3,758 | 3,687
Long-Lived Assets | $ 1,155 |  |  |  | $ 1,177 |  |  |  | $ 1,155 | $ 1,177 | $ 1,176

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