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Summary of Geographic Segment Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 5,402 | $ 9,172 | $ 9,124
Assets exclusive of assets under vehicle programs | 8,365 | 9,311 | 6,370
Assets under vehicle programs | 9,173 | 13,815 | 12,779
Long-Lived Assets | 2,568 | 2,691 | 2,653
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 3,758 | 5,867 | 5,708
Assets exclusive of assets under vehicle programs | 5,262 | 5,830 | 3,494
Assets under vehicle programs | 6,797 | 9,824 | 9,021
Long-Lived Assets | 1,421 | 1,536 | 1,476
All Other Countries |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 1,644 | 3,305 | 3,416
Assets exclusive of assets under vehicle programs | 3,103 | 3,481 | 2,876
Assets under vehicle programs | 2,376 | 3,991 | 3,758
Long-Lived Assets | $ 1,147 | $ 1,155 | $ 1,177

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