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Summary of Geographic Segment Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | $ 8,848 | $ 8,659 | $ 8,502
Assets exclusive of assets under vehicle programs | 5,820 | 6,065 | 5,918
Assets under vehicle programs | 11,879 | 11,578 | 11,716
Long-Lived Assets | 2,627 | 2,562 | 2,571
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 5,629 | 5,674 | 5,635
Assets exclusive of assets under vehicle programs | 3,069 | 3,699 | 3,677
Assets under vehicle programs | 8,192 | 8,552 | 8,786
Long-Lived Assets | 1,451 | 1,489 | 1,502
All Other Countries |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 3,219 | 2,985 | 2,867
Assets exclusive of assets under vehicle programs | 2,751 | 2,366 | 2,241
Assets under vehicle programs | 3,687 | 3,026 | 2,930
Long-Lived Assets | $ 1,176 | $ 1,073 | $ 1,069

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