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Net Debt - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Net debt | $ 2,529 | $ 2,665 | $ 1,965
Intercontinental San Juan [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Lease termination | 90 |  |
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Net debt | $ 2,375 | $ 2,241 |

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