Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Reclassifications	Reclassifications Certain prior year financial statement amounts have been reclassified to conform with the current year presentation.
New Accounting Standards	New Accounting Standards In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which is intended to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The standard is effective for annual periods beginning after December 15, 2018, with early adoption permitted. We are evaluating its impact on our consolidated financial statements and the disclosure requirements. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The standard adopts a two-step approach wherein, if substantially all of the fair value of the gross assets acquired is concentrated in a single (group of similar) identifiable asset(s), then the transaction would be considered an asset purchase. As a result of the standard, we anticipate that the majority of our hotel purchases will be considered asset purchases as opposed to business combinations. We do not expect the determination to materially change the recognition of the assets and liabilities acquired. This standard will be applied on a prospective basis and is effective for annual periods beginning after December 15, 2017, with early adoption permitted. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires that, on the statement of cash flows, amounts generally described as restricted cash or restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning and ending total amounts thereof. We adopted this standard beginning January 1, 2017. As a result, amounts included in restricted cash and furniture, fixtures and equipment replacement fund on our consolidated balance sheet are included with cash and cash equivalents on the statement of cash flows. We have restated the statement of cash flows for the year-to-date period ended September 30, 2016 to reflect this change. The adoption of this standard did not change our consolidated balance sheet presentation. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify accounting for share-based payment transactions and will affect the classification of certain share-based awards and related income tax withholdings. We adopted this standard beginning January 1, 2017. As a result of the standard, the majority of our share-based payment awards granted in 2017 are equity-classified awards, and the excess tax benefits or deficiencies that are generated or incurred based on the difference between the intrinsic value of the award and the grant-date fair value is recognized as income tax benefit or expense on the income statement. The adoption of this standard has not had a material effect on our consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The standard sets forth steps to determine the timing and amount of revenue to be recognized to depict the transfer of goods or services in an amount that reflects the consideration that the entity expects in exchange. Beginning in 2015, the FASB has issued a number of ASUs to provide further clarification related to this standard and to defer the effective date to reporting periods beginning after December 15, 2017. Additionally, in February 2017, the FASB issued ASU No. 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), which is required to be adopted concurrently, as it provides further guidance on accounting for the derecognition of and partial sales of a non-financial asset. Based on our assessment of this standard, it will not materially affect the amount or timing of revenue recognition for revenues from room, food and beverage, and other hotel level sales; however, it may allow for earlier gain recognition for certain asset sale transactions pursuant to which we have continuing involvement with the asset. We will adopt this standard on January 1, 2018 and are evaluating new disclosure requirements. Upon adoption, we expect to implement these standards using a modified retrospective approach with a cumulative effect recognized with no restatements of prior period amounts. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which affects aspects of accounting for lease agreements. Under this standard, all leases, including operating leases, will require recognition of the lease assets and lease liabilities by lessees on the balance sheet. However, the net effect on the statement of operations and the statement of cash flows largely is unchanged. The standard is effective for fiscal years beginning after December 15, 2018. The standard requires a modified retrospective approach, with restatement of the periods presented in the year of adoption. The primary impact of the new standard will be to the treatment of our 25 ground leases, which represent approximately 85% of our annual operating lease payments. While we have not completed our analysis, we believe that application of this standard will result in the recording of a right of use asset and the related lease liability of between $400 million and $500 million for the ground leases, although changes in discount rates, ground lease terms or other variables may have a significant effect on this analysis. We expect the adoption of this standard to have minimal impact on our income statement.

New Accounting Standards

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which is intended to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The standard is effective for annual periods beginning after December 15, 2018, with early adoption permitted. We are evaluating its impact on our consolidated financial statements and the disclosure requirements.

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The standard adopts a two-step approach wherein, if substantially all of the fair value of the gross assets acquired is concentrated in a single (group of similar) identifiable asset(s), then the transaction would be considered an asset purchase. As a result of the standard, we anticipate that the majority of our hotel purchases will be considered asset purchases as opposed to business combinations. We do not expect the determination to materially change the recognition of the assets and liabilities acquired. This standard will be applied on a prospective basis and is effective for annual periods beginning after December 15, 2017, with early adoption permitted.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires that, on the statement of cash flows, amounts generally described as restricted cash or restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning and ending total amounts thereof. We adopted this standard beginning January 1, 2017. As a result, amounts included in restricted cash and furniture, fixtures and equipment replacement fund on our consolidated balance sheet are included with cash and cash equivalents on the statement of cash flows. We have restated the statement of cash flows for the year-to-date period ended September 30, 2016 to reflect this change. The adoption of this standard did not change our consolidated balance sheet presentation.

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify accounting for share-based payment transactions and will affect the classification of certain share-based awards and related income tax withholdings. We adopted this standard beginning January 1, 2017. As a result of the standard, the majority of our share-based payment awards granted in 2017 are equity-classified awards, and the excess tax benefits or deficiencies that are generated or incurred based on the difference between the intrinsic value of the award and the grant-date fair value is recognized as income tax benefit or expense on the income statement. The adoption of this standard has not had a material effect on our consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The standard sets forth steps to determine the timing and amount of revenue to be recognized to depict the transfer of goods or services in an amount that reflects the consideration that the entity expects in exchange. Beginning in 2015, the FASB has issued a number of ASUs to provide further clarification related to this standard and to defer the effective date to reporting periods beginning after December 15, 2017. Additionally, in February 2017, the FASB issued ASU No. 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), which is required to be adopted concurrently, as it provides further guidance on accounting for the derecognition of and partial sales of a non-financial asset. Based on our assessment of this standard, it will not materially affect the amount or timing of revenue recognition for revenues from room, food and beverage, and other hotel level sales; however, it may allow for earlier gain recognition for certain asset sale transactions pursuant to which we have continuing involvement with the asset. We will adopt this standard on January 1, 2018 and are evaluating new disclosure requirements. Upon adoption, we expect to implement these standards using a modified retrospective approach with a cumulative effect recognized with no restatements of prior period amounts.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which affects aspects of accounting for lease agreements. Under this standard, all leases, including operating leases, will require recognition of the lease assets and lease liabilities by lessees on the balance sheet. However, the net effect on the statement of operations and the statement of cash flows largely is unchanged. The standard is effective for fiscal years beginning after December 15, 2018. The standard requires a modified retrospective approach, with restatement of the periods presented in the year of adoption. The primary impact of the new standard will be to the treatment of our 25 ground leases, which represent approximately 85% of our annual operating lease payments. While we have not completed our analysis, we believe that application of this standard will result in the recording of a right of use asset and the related lease liability of between $400 million and $500 million for the ground leases, although changes in discount rates, ground lease terms or other variables may have a significant effect on this analysis. We expect the adoption of this standard to have minimal impact on our income statement.