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Equity Method Investment Summarized Financial Information, Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions [Abstract]    
Assets (primarily comprised of hotel real estate managed by us) $ 1,499us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets $ 1,832us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Liabilities $ 1,287us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities $ 1,482us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities