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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | $ 63 | $ 53 | $ 58 | $ 57
Accrued interest payable on potential tax liabilities | 44 | 31 |  |
Current Income Taxes Payable |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | 17 | 0 |  |
Noncurrent Income Taxes Payable |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | 21 | 33 |  |
Non Avis Budget Car Rental Tax Contingencies |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | $ 17 | $ 13 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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