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Debt - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Entity
Dec. 31, 2013
Dec. 31, 2012
Oct. 30, 2014
Jun. 25, 2014
Jun. 15, 2014
Dec. 31, 2013
Jan. 10, 2014
Feb. 28, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 19, 2013
May 31, 2013
Mar. 31, 2013
Dec. 31, 2011
Dec. 31, 2009
Debt Instrument [Line Items]                                
Redemption price of senior notes $ 150us-gaap_RepaymentsOfSeniorDebt $ 801us-gaap_RepaymentsOfSeniorDebt $ 1,795us-gaap_RepaymentsOfSeniorDebt                          
Mortgage on debt principal reduction after refinancing 4,007.0us-gaap_DebtInstrumentCarryingAmount                              
Redemption price percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage                              
Exchangeable senior debentures 386us-gaap_ConvertibleDebt 371us-gaap_ConvertibleDebt         371us-gaap_ConvertibleDebt                  
Aggregate borrowing capacity 1,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity                              
Additional borrowing capacity 500hst_LineOfCreditFacilityAdditionalBorrowingCapacity                              
Credit facility 704us-gaap_LineOfCredit 946us-gaap_LineOfCredit         946us-gaap_LineOfCredit                  
Repayments on credit facility 225us-gaap_RepaymentsOfLinesOfCredit 207us-gaap_RepaymentsOfLinesOfCredit 89us-gaap_RepaymentsOfLinesOfCredit                          
Amount of borrowing capacity currently available under the credit facility 796us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity                              
Draws on credit facility 4us-gaap_ProceedsFromLinesOfCredit 393us-gaap_ProceedsFromLinesOfCredit 231us-gaap_ProceedsFromLinesOfCredit                          
Leverage ratio 2.6hst_LeverageRatio                              
Cash and cash equivalents 684us-gaap_CashAndCashEquivalentsAtCarryingValue 861us-gaap_CashAndCashEquivalentsAtCarryingValue 417us-gaap_CashAndCashEquivalentsAtCarryingValue       861us-gaap_CashAndCashEquivalentsAtCarryingValue               826us-gaap_CashAndCashEquivalentsAtCarryingValue  
Assets that are secured by mortgage debt 10hst_NumberOfAssetsSecuredByMortgageDebt                              
Interest Expense                                
Debt Instrument [Line Items]                                
Loss on extinguishment 4us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 36us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 30us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		                          
7.125% Dulles Airport Industrial Development Revenue Bonds                                
Debt Instrument [Line Items]                                
Debt interest rate       7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hst_DullesAirportIndustrialDevelopmentRevenueBondsMember		                        
Repayment of debt       12us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_FinancialInstrumentAxis
= hst_DullesAirportIndustrialDevelopmentRevenueBondsMember		                        
7.75% Philadelphia Airport Industrial Development Revenue Bonds                                
Debt Instrument [Line Items]                                
Debt interest rate         7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hst_PhiladelphiaAirportIndustrialDevelopmentRevenueBondsMember		                      
Repayment of debt         40us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_FinancialInstrumentAxis
= hst_PhiladelphiaAirportIndustrialDevelopmentRevenueBondsMember		                      
7% Newark Airport Industrial Development Refunding Revenue Bonds                                
Debt Instrument [Line Items]                                
Debt interest rate           7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_FinancialInstrumentAxis
= hst_NewarkAirportIndustrialDevelopmentRefundingRevenueBondsMember		                    
Repayment of debt           32us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_FinancialInstrumentAxis
= hst_NewarkAirportIndustrialDevelopmentRefundingRevenueBondsMember		                    
Covenant Requiring Guarantees                                
Debt Instrument [Line Items]                                
Leverage ratio 6.0hst_LeverageRatio
/ us-gaap_DebtSecurityAxis
= hst_CovenantRequiringGuaranteesMember		                              
US Currency                                
Debt Instrument [Line Items]                                
Draws on credit facility             118us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_InformationByFinancialStatementLineItemAxis
= hst_USCurrencyMember		                  
Revolver                                
Debt Instrument [Line Items]                                
Credit facility maturity date Jun. 27, 2018                              
Renewal period of credit facility Two six-month renewal options                              
Line of credit interest terms We pay interest on revolver borrowings under the credit facility at floating rates equal to LIBOR plus a margin                              
Facility commitment fee 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= hst_RevolverMember		                              
Revolver | LIBOR                                
Debt Instrument [Line Items]                                
Basis points addition 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hst_RevolverMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Term Loan                                
Debt Instrument [Line Items]                                
Line of credit facility, interest rate 1.29%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= hst_TermLoanMember		                              
Credit facility maturity date Jun. 27, 2017                              
Credit facility 500us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= hst_TermLoanMember		                              
Renewal period of credit facility Two one-year renewal options                              
Line of credit interest terms Interest on the term loan consists of floating rates plus a margin ranging from 90 to 175 basis points (depending on Host L.P.’s unsecured long-term debt rating). Based on Host L.P.’s unsecured long-term debt rating at December 31, 2014, the margin is 112.5 basis points for an all-in interest rate of 1.29%.                              
Term Loan | LIBOR                                
Debt Instrument [Line Items]                                
Basis points addition 1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hst_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Foreign Currency Borrowings                                
Debt Instrument [Line Items]                                
Aggregate borrowing capacity 500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= hst_ForeignCurrencyBorrowingsMember		                              
Swingline Loans                                
Debt Instrument [Line Items]                                
Aggregate borrowing capacity 100us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= hst_SwinglineLoansMember		                              
Letter of Credit                                
Debt Instrument [Line Items]                                
Aggregate borrowing capacity 100us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LetterOfCreditMember		                              
Credit facility                                
Debt Instrument [Line Items]                                
Repayments on credit facility               225us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember		                
Credit facility | Foreign Currency                                
Debt Instrument [Line Items]                                
Repayments on credit facility             7us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_InformationByFinancialStatementLineItemAxis
= hst_ForeignCurrencyMember
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember		                  
Draws on credit facility   68us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_InformationByFinancialStatementLineItemAxis
= hst_ForeignCurrencyMember
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember		                            
Upper Limit | Revolver | Investment grade | LIBOR                                
Debt Instrument [Line Items]                                
Basis points addition 1.55%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hst_RevolverMember
/ us-gaap_InvestmentTypeAxis
= hst_InvestmentGradeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Facility commitment fee 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= hst_RevolverMember
/ us-gaap_InvestmentTypeAxis
= hst_InvestmentGradeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Upper Limit | Term Loan | Investment grade | LIBOR                                
Debt Instrument [Line Items]                                
Basis points addition 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hst_TermLoanMember
/ us-gaap_InvestmentTypeAxis
= hst_InvestmentGradeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Lower Limit | Revolver | Investment grade | LIBOR                                
Debt Instrument [Line Items]                                
Basis points addition 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hst_RevolverMember
/ us-gaap_InvestmentTypeAxis
= hst_InvestmentGradeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Facility commitment fee 0.125%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= hst_RevolverMember
/ us-gaap_InvestmentTypeAxis
= hst_InvestmentGradeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Lower Limit | Term Loan | Investment grade | LIBOR                                
Debt Instrument [Line Items]                                
Basis points addition 0.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hst_TermLoanMember
/ us-gaap_InvestmentTypeAxis
= hst_InvestmentGradeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		                              
Series Q senior notes 6.75% due June 2016                                
Debt Instrument [Line Items]                                
Debt interest rate 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		               6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		          
Repayment of debt   400us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		             150us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		 200us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		 200us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		          
Redemption price of senior notes   404us-gaap_RepaymentsOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		             152us-gaap_RepaymentsOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= hst_SeriesQSeniorNotesSixPointSevenFivePercentDueJuneTwentySixteenMember		              
Series D senior notes 3.75% due October 2023                                
Debt Instrument [Line Items]                                
Face amount of debt                       400us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= hst_SeriesDSeniorNotesThreePointSevenFivePercentDueOctoberTwentyTwentyThreeMember		        
Debt interest rate                       3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_SeriesDSeniorNotesThreePointSevenFivePercentDueOctoberTwentyTwentyThreeMember		        
Proceed from issuance of note                       396us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= hst_SeriesDSeniorNotesThreePointSevenFivePercentDueOctoberTwentyTwentyThreeMember		        
Series T senior notes 9% due May 2017                                
Debt Instrument [Line Items]                                
Debt interest rate                         9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_SeriesTSeniorNotesNinePercentDueMayTwentySeventeenMember		      
Repayment of debt                         400us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= hst_SeriesTSeniorNotesNinePercentDueMayTwentySeventeenMember		      
Redemption price of senior notes                         418us-gaap_RepaymentsOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= hst_SeriesTSeniorNotesNinePercentDueMayTwentySeventeenMember		      
Exchangeable 2004 senior debentures 3.25% due April 2024                                
Debt Instrument [Line Items]                                
Debt interest rate                           3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroFourSeniorDebenturesThreePointTwoFivePercentDueAprilTwentyTwentyFourMember		    
Exchangeable Debentures                           174us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroFourSeniorDebenturesThreePointTwoFivePercentDueAprilTwentyTwentyFourMember		    
Debt converted into shares of Host Inc. common stock                           11.7us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroFourSeniorDebenturesThreePointTwoFivePercentDueAprilTwentyTwentyFourMember		    
Common OP units issued                           11.5us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroFourSeniorDebenturesThreePointTwoFivePercentDueAprilTwentyTwentyFourMember		    
Debentures redeemed for cash                           1us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroFourSeniorDebenturesThreePointTwoFivePercentDueAprilTwentyTwentyFourMember		    
Exchangeable 2009 Senior Debentures 2.5% Due October 2029                                
Debt Instrument [Line Items]                                
Unamortized discount 14us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Debt interest rate 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Mortgage on debt principal reduction after refinancing 400.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                             316.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember
Debt issuance date Dec. 22, 2009                              
Percentage of closing exchange price common stock 130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Current equivalent exchange price $ 16.71us-gaap_DebtInstrumentConvertibleStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Debt exchange description at any time at which the closing price of Host Inc.’s common stock is more than 130% ($16.71) of the exchange price per share for at least 20 of the last 30 consecutive trading days of the calendar quarter or at any time up to two days prior to the date on which the 2009 Debentures have been called for redemption                              
Excess fair value over principal value 339us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Current exchange rate for each $1,000 of principal 77.8265us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Current equivalent exchange price $ 12.85us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Exchangeable share equivalents 31.1us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Debt Instrument convertible threshold trading days 20us-gaap_DebtInstrumentConvertibleThresholdTradingDays
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                              
Debt Instrument convertible threshold consecutive trading days 30 days                              
Effective interest rate                               6.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember
Initial equity value of exchangeable debenture                               82us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember
Exchangeable senior debentures 386us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		 371us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		         371us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= hst_ExchangeableTwentyZeroNineSeniorDebenturesTwoPointFivePercentDueOctoberTwentyTwentyNineMember		                  
Renewal options                                
Debt Instrument [Line Items]                                
Credit facility maturity date Jun. 27, 2019                              
Covenant Requirement | Credit facility                                
Debt Instrument [Line Items]                                
Debt covenant compliance As of December 31, 2014, we are in compliance with the financial covenants under our credit facility.                              
Debt instrument covenant description Additionally, total debt used in the calculation of our leverage ratio is based on a “net debt” concept, under which cash and cash equivalents in excess of $100 million are deducted from our total debt balance.                              
Covenant Requirement | Upper Limit | Credit facility                                
Debt Instrument [Line Items]                                
Leverage ratio 7.25hst_LeverageRatio
/ us-gaap_DebtInstrumentAxis
= hst_CovenantRequirementMember
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                              
Covenant Requirement | Lower Limit | Credit facility                                
Debt Instrument [Line Items]                                
Unsecured interest coverage ratio 1.75hst_CoverageRatio
/ us-gaap_DebtInstrumentAxis
= hst_CovenantRequirementMember
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                              
Fixed charge coverage ratio 1.25hst_FixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= hst_CovenantRequirementMember
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                              
Cash and cash equivalents 100us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_DebtInstrumentAxis
= hst_CovenantRequirementMember
/ us-gaap_LineOfCreditFacilityAxis
= hst_CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                              
Debt Covenant | Less Restrictive Covenant                                
Debt Instrument [Line Items]                                
Leverage ratio 6.0hst_LeverageRatio
/ us-gaap_DebtInstrumentAxis
= hst_DebtCovenantMember
/ us-gaap_DebtSecurityAxis
= hst_LessRestrictiveCovenantMember		                              
Senior Notes                                
Debt Instrument [Line Items]                                
Face amount of debt 2,900us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 3,100us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		         3,100us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Unamortized discount 16us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 32us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		         32us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Debt covenant compliance As of December 31, 2014, we are in compliance with all of these covenants.                              
Senior Notes | Upper Limit                                
Debt Instrument [Line Items]                                
Debt repurchase authorized amount $ 500hst_DebtRepurchaseAuthorizedAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                              
Mortgages                                
Debt Instrument [Line Items]                                
Debt covenant compliance As of December 31, 2014, we are in compliance with the covenants under all of our mortgage debt obligations.                              
Average interest rate 5.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 4.10%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		         4.10%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember