Consolidated Variable Interest Entities and Investments in Affiliates - Schedule of Investments in Affiliates (Parenthetical) (Detail) - Hilton Berlin [Member] - Subsequent Event [Member] € in Millions	Apr. 30, 2018 EUR (€)
Schedule Of Equity Method Investments [Line Items]
Sale price of disposal	€ 297
Cash deposit held in escrow as earnest money for disposal	€ 30