XML 527 R171.htm IDEA: XBRL DOCUMENT v3.20.4
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