Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]
New Accounting Standards	New Accounting Standards In March 2016, the Financial Accounting Standards Board (“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 tax withholdings. The standard is effective for fiscal years beginning after December 15, 2016, with early adoption permitted. We do not anticipate implementation will have a material effect on our financial statements or on the stock compensation plans currently outstanding; however, its effect on future stock compensation plans will be dependent upon the design of those plans. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which affects aspects of accounting for lease agreements. Under the new standard, all leases, including those that previously were accounted for as operating leases, will require recognition of the lease assets and lease liabilities by lessees on the balance sheet. However, the 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, with early application permitted. We have not yet completed our assessment of the effect of the new standard on our financial statements. In February 2015, the FASB issued ASU No. 2015-02, Amendments to the Consolidation Analysis. The ASU amends the consolidation guidance for variable interest entities (VIEs) and general partners' investments in limited partnerships and modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015. Specifically, as a result of the elimination of the presumption that a general partner should consolidate a limited partnership, and that these partnerships should be evaluated under the VIE or Voting Interest model, we re-evaluated the VIE determination of our non-wholly-owned partnerships. We adopted this standard January 1, 2016, and applied the changes retrospectively. As a result, we no longer consolidate the partnership that owns the Fort Lauderdale Marriott Harbor Beach Resort & Spa, of which we are the managing partner and hold 49.9% of the partnership interests, due to the voting rights of the third-party owner. Accordingly, the operations, assets and liabilities of the hotel no longer are included in our consolidated financial statements. Instead, we have included our interest in the hotel based on the carrying amount on January 1, 2015 in advances to and investments in affiliates and our portion of the hotel’s earnings are recorded to equity in earnings of affiliates, with no cumulative-effect adjustment. As a result of the adoption of this ASU, total assets and total liabilities at December 31, 2015 were reduced by $128 million and $150 million, respectively. In addition, total revenues for the quarter and year-to-date ended June 30, 2015 were reduced by $10 million and $25 million, respectively, while net income for the quarter and year-to-date ended June 30, 2015 were reduced by $2 million and $7 million, respectively. The deconsolidation of this entity had no effect on the total equity of Host Inc. stockholders, total Host L.P capital or net income attributable to Host Inc. or Host L.P. Additionally, three partnerships now are considered VIE’s, as the general partner maintains control over the decisions that most significantly impact the partnerships; however, this consideration did not change the consolidation determination. This conclusion includes the operating partnership, Host L.P., which is consolidated by Host Inc., of which Host Inc. is the general partner and holds 99% of the limited partner interests. Host Inc.’s sole significant asset is its investment in Host L.P. and, consequently, substantially all of Host Inc.’s assets and liabilities represent assets and liabilities of Host L.P. All of Host Inc.’s debt is an obligation of Host L.P and may be settled only with assets of Host L.P. We also determined that our consolidated partnership that owns the Houston Airport Marriott at George Bush Intercontinental, of which we are the general partner and hold 85% of the partnership interests, is a VIE. The total assets of this VIE at June 30, 2016 are $62 million and consist of cash and property and equipment. Liabilities for the VIE total $3 million and consist of accounts payable and deferred revenue. The unconsolidated partnership that owns the Philadelphia Marriott Downtown, of which we hold 11% of the limited partner interests, also is a VIE. The carrying amount of this investment at June 30, 2016 is $(7) million and is included in advances to and investments in affiliates. The mortgage debt held by this VIE is non-recourse to us. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which affects virtually all aspects of an entity’s revenue recognition. The new 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 to which the entity expects in exchange. In March, April and May 2016, the FASB issued ASUs No. 2016-08, 2016-10 and 2016-12, respectively, all related to Revenue from Contracts with Customers (Topic 606), which further clarify the application of the standard. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which deferred the effectiveness of ASU No. 2014-09 to reporting periods beginning after December 15, 2017 and permitted early application for annual reporting periods beginning after December 15, 2016. We have not yet completed our assessment of the effect of the new standard on our financial statements, including possible transition alternatives.

New Accounting Standards

In March 2016, the Financial Accounting Standards Board (“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 tax withholdings. The standard is effective for fiscal years beginning after December 15, 2016, with early adoption permitted. We do not anticipate implementation will have a material effect on our financial statements or on the stock compensation plans currently outstanding; however, its effect on future stock compensation plans will be dependent upon the design of those plans.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which affects aspects of accounting for lease agreements. Under the new standard, all leases, including those that previously were accounted for as operating leases, will require recognition of the lease assets and lease liabilities by lessees on the balance sheet. However, the 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, with early application permitted. We have not yet completed our assessment of the effect of the new standard on our financial statements.

In February 2015, the FASB issued ASU No. 2015-02, Amendments to the Consolidation Analysis. The ASU amends the consolidation guidance for variable interest entities (VIEs) and general partners' investments in limited partnerships and modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015. Specifically, as a result of the elimination of the presumption that a general partner should consolidate a limited partnership, and that these partnerships should be evaluated under the VIE or Voting Interest model, we re-evaluated the VIE determination of our non-wholly-owned partnerships. We adopted this standard January 1, 2016, and applied the changes retrospectively. As a result, we no longer consolidate the partnership that owns the Fort Lauderdale Marriott Harbor Beach Resort & Spa, of which we are the managing partner and hold 49.9% of the partnership interests, due to the voting rights of the third-party owner. Accordingly, the operations, assets and liabilities of the hotel no longer are included in our consolidated financial statements. Instead, we have included our interest in the hotel based on the carrying amount on January 1, 2015 in advances to and investments in affiliates and our portion of the hotel’s earnings are recorded to equity in earnings of affiliates, with no cumulative-effect adjustment. As a result of the adoption of this ASU, total assets and total liabilities at December 31, 2015 were reduced by $128 million and $150 million, respectively. In addition, total revenues for the quarter and year-to-date ended June 30, 2015 were reduced by $10 million and $25 million, respectively, while net income for the quarter and year-to-date ended June 30, 2015 were reduced by $2 million and $7 million, respectively. The deconsolidation of this entity had no effect on the total equity of Host Inc. stockholders, total Host L.P capital or net income attributable to Host Inc. or Host L.P.

Additionally, three partnerships now are considered VIE’s, as the general partner maintains control over the decisions that most significantly impact the partnerships; however, this consideration did not change the consolidation determination. This conclusion includes the operating partnership, Host L.P., which is consolidated by Host Inc., of which Host Inc. is the general partner and holds 99% of the limited partner interests. Host Inc.’s sole significant asset is its investment in Host L.P. and, consequently, substantially all of Host Inc.’s assets and liabilities represent assets and liabilities of Host L.P. All of Host Inc.’s debt is an obligation of Host L.P and may be settled only with assets of Host L.P. We also determined that our consolidated partnership that owns the Houston Airport Marriott at George Bush Intercontinental, of which we are the general partner and hold 85% of the partnership interests, is a VIE. The total assets of this VIE at June 30, 2016 are $62 million and consist of cash and property and equipment. Liabilities for the VIE total $3 million and consist of accounts payable and deferred revenue. The unconsolidated partnership that owns the Philadelphia Marriott Downtown, of which we hold 11% of the limited partner interests, also is a VIE. The carrying amount of this investment at June 30, 2016 is $(7) million and is included in advances to and investments in affiliates. The mortgage debt held by this VIE is non-recourse to us.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which affects virtually all aspects of an entity’s revenue recognition. The new 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 to which the entity expects in exchange. In March, April and May 2016, the FASB issued ASUs No. 2016-08, 2016-10 and 2016-12, respectively, all related to Revenue from Contracts with Customers (Topic 606), which further clarify the application of the standard. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which deferred the effectiveness of ASU No. 2014-09 to reporting periods beginning after December 15, 2017 and permitted early application for annual reporting periods beginning after December 15, 2016. We have not yet completed our assessment of the effect of the new standard on our financial statements, including possible transition alternatives.