Basis of Presentation	9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The condensed consolidated financial statements present the results of operations, financial position, and cash flows of Marriott International, Inc. (“Marriott,” and together with its consolidated subsidiaries, “we,” “us,” or “the Company”). We also refer throughout to (i) our Condensed Consolidated Financial Statements as our “Financial Statements,” (ii) our Condensed Consolidated Statements of Income as our “Income Statements,” (iii) our Condensed Consolidated Balance Sheets as our “Balance Sheets,” (iv) our properties, brands, or markets in the United States (“U.S.”) and Canada as “North America” or “North American,” and (v) our properties, brands, or markets outside of the U.S. and Canada as “International.” References throughout to numbered “Footnotes” refer to the numbered Notes in these Notes to Condensed Consolidated Financial Statements, unless otherwise noted. These Financial Statements have not been audited. We have condensed or omitted certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements in this report should be read in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (“2015 Form 10-K”). Certain terms not otherwise defined in this Form 10-Q have the meanings specified in our 2015 Form 10-K. Preparation of financial statements that conform with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements, the reported amounts of revenues and expenses during the reporting periods, and the disclosures of contingent liabilities. Accordingly, ultimate results could differ from those estimates. The accompanying Financial Statements reflect all normal and recurring adjustments necessary to present fairly our financial position as of September 30, 2016 and December 31, 2015, the results of our operations for the three and nine months ended September 30, 2016 and September 30, 2015, and cash flows for the nine months ended September 30, 2016 and September 30, 2015. Interim results may not be indicative of fiscal year performance because of seasonal and short-term variations. We have eliminated all material intercompany transactions and balances between entities consolidated in these Financial Statements. We have made certain reclassifications of our prior year amounts to conform to our current presentation of “Brands” and “Deferred tax liabilities” in our Balance Sheets and “Merger-related costs and charges” in our Income Statements. Acquisition of Starwood Hotels & Resorts Worldwide On September 23, 2016, we completed the acquisition of Starwood Hotels & Resorts Worldwide, LLC, formerly known as Starwood Hotels & Resorts Worldwide, Inc. (“Starwood”) through a series of transactions, after which Starwood became an indirect wholly-owned subsidiary of the Company (the “Starwood Combination”). The Financial Statements in this report include Starwood’s results of operations for the eight days ended September 30, 2016 and reflect the financial position of our combined company at September 30, 2016. We refer to our business associated with brands that existed prior to the Starwood Combination as “Legacy-Marriott” and to Starwood’s business and brands that we acquired as “Legacy-Starwood.” See Footnote No. 2, “Acquisitions and Dispositions” for more information on the Starwood Combination. New Accounting Standards Accounting Standards Update No. 2014-09 - “Revenue from Contracts with Customers” (“ASU No. 2014-09”) ASU No. 2014-09 supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, as well as most industry-specific guidance, and significantly enhances comparability of revenue recognition practices across entities and industries by providing a principles-based, comprehensive framework for addressing revenue recognition issues. In order for a provider of promised goods or services to recognize as revenue the consideration that it expects to receive in exchange for the promised goods or services, the provider should apply the following five steps: (1) identify the contract with a customer(s); (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU No. 2014-09 also specifies the accounting for some costs to obtain or fulfill a contract with a customer and provides enhanced disclosure requirements. The Financial Accounting Standards Board (“FASB”) has deferred ASU No. 2014-09 for one year, and with that deferral, the standard will be effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, which for us will be our 2018 first quarter. We are permitted to use either the retrospective or the modified retrospective method when adopting ASU No. 2014-09. We are still assessing the potential impact that ASU No. 2014-09 will have on our financial statements and disclosures, but we believe that there could be changes to the revenue recognition of real estate sales, franchise fees, and incentive management fees. Accounting Standards Update No. 2016-02 - “Leases” (“ASU No. 2016-02”) In February 2016, the FASB issued ASU No. 2016-02, which introduces a lessee model that brings substantially all leases onto the balance sheet. Under the new standard, a lessee will recognize on its balance sheet a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months. The new standard will also distinguish leases as either finance leases or operating leases. This distinction will affect how leases are measured and presented in the income statement and statement of cash flows. ASU No. 2016-02 is effective for annual and interim periods in fiscal years beginning after December 15, 2018. We are still assessing the potential impact that ASU No. 2016-02 will have on our financial statements and disclosures. Accounting Standards Update No. 2016-09 - “Stock Compensation” (“ASU No. 2016-09”) In March 2016, the FASB issued ASU No. 2016-09, which involves several aspects of the accounting for share-based payments. The new guidance will require excess tax benefits to be recorded as income tax expense (or benefit) in the income statement. Currently, excess tax benefits are recorded in additional paid-in-capital in the balance sheet. In the statement of cash flows, the new guidance requires both excess tax benefits and employee tax withholdings to be presented as operating inflows rather than as financing inflows. ASU No. 2016-09 is effective for annual and interim periods beginning after December 15, 2016. We are still assessing the potential impact that ASU No. 2016-09 will have on our financial statements and disclosures, but we believe that, during periods when our stock price increases, it will generally result in (1) a decrease to our income tax expense and effective tax rate and (2) an increase to our cash flows from operating activities.

BASIS OF PRESENTATION

The condensed consolidated financial statements present the results of operations, financial position, and cash flows of Marriott International, Inc. (“Marriott,” and together with its consolidated subsidiaries, “we,” “us,” or “the Company”). We also refer throughout to (i) our Condensed Consolidated Financial Statements as our “Financial Statements,” (ii) our Condensed Consolidated Statements of Income as our “Income Statements,” (iii) our Condensed Consolidated Balance Sheets as our “Balance Sheets,” (iv) our properties, brands, or markets in the United States (“U.S.”) and Canada as “North America” or “North American,” and (v) our properties, brands, or markets outside of the U.S. and Canada as “International.” References throughout to numbered “Footnotes” refer to the numbered Notes in these Notes to Condensed Consolidated Financial Statements, unless otherwise noted.

These Financial Statements have not been audited. We have condensed or omitted certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements in this report should be read in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (“2015 Form 10-K”). Certain terms not otherwise defined in this Form 10-Q have the meanings specified in our 2015 Form 10-K.

Preparation of financial statements that conform with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements, the reported amounts of revenues and expenses during the reporting periods, and the disclosures of contingent liabilities. Accordingly, ultimate results could differ from those estimates.

The accompanying Financial Statements reflect all normal and recurring adjustments necessary to present fairly our financial position as of September 30, 2016 and December 31, 2015, the results of our operations for the three and nine months ended September 30, 2016 and September 30, 2015, and cash flows for the nine months ended September 30, 2016 and September 30, 2015. Interim results may not be indicative of fiscal year performance because of seasonal and short-term variations. We have eliminated all material intercompany transactions and balances between entities consolidated in these Financial Statements. We have made certain reclassifications of our prior year amounts to conform to our current presentation of “Brands” and “Deferred tax liabilities” in our Balance Sheets and “Merger-related costs and charges” in our Income Statements.

Acquisition of Starwood Hotels & Resorts Worldwide

On September 23, 2016, we completed the acquisition of Starwood Hotels & Resorts Worldwide, LLC, formerly known as Starwood Hotels & Resorts Worldwide, Inc. (“Starwood”) through a series of transactions, after which Starwood became an indirect wholly-owned subsidiary of the Company (the “Starwood Combination”). The Financial Statements in this report include Starwood’s results of operations for the eight days ended September 30, 2016 and reflect the financial position of our combined company at September 30, 2016. We refer to our business associated with brands that existed prior to the Starwood Combination as “Legacy-Marriott” and to Starwood’s business and brands that we acquired as “Legacy-Starwood.” See Footnote No. 2, “Acquisitions and Dispositions” for more information on the Starwood Combination.

New Accounting Standards

Accounting Standards Update No. 2014-09 - “Revenue from Contracts with Customers” (“ASU No. 2014-09”)

ASU No. 2014-09 supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, as well as most industry-specific guidance, and significantly enhances comparability of revenue recognition practices across entities and industries by providing a principles-based, comprehensive framework for addressing revenue recognition issues. In order for a provider of promised goods or services to recognize as revenue the consideration that it expects to receive in exchange for the promised goods or services, the provider should apply the following five steps: (1) identify the contract with a customer(s); (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU No. 2014-09 also specifies the accounting for some costs to obtain or fulfill a contract with a customer and provides enhanced disclosure requirements. The Financial Accounting Standards Board (“FASB”) has deferred ASU No. 2014-09 for one year, and with that deferral, the standard will be effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, which for us will be our 2018 first quarter. We are permitted to use either the retrospective or the modified retrospective method when adopting ASU No. 2014-09. We are still assessing the potential impact that ASU No. 2014-09 will have on our financial statements and disclosures, but we believe that there could be changes to the revenue recognition of real estate sales, franchise fees, and incentive management fees.

Accounting Standards Update No. 2016-02 - “Leases” (“ASU No. 2016-02”)

In February 2016, the FASB issued ASU No. 2016-02, which introduces a lessee model that brings substantially all leases onto the balance sheet. Under the new standard, a lessee will recognize on its balance sheet a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months. The new standard will also distinguish leases as either finance leases or operating leases. This distinction will affect how leases are measured and presented in the income statement and statement of cash flows. ASU No. 2016-02 is effective for annual and interim periods in fiscal years beginning after December 15, 2018. We are still assessing the potential impact that ASU No. 2016-02 will have on our financial statements and disclosures.

Accounting Standards Update No. 2016-09 - “Stock Compensation” (“ASU No. 2016-09”)

In March 2016, the FASB issued ASU No. 2016-09, which involves several aspects of the accounting for share-based payments. The new guidance will require excess tax benefits to be recorded as income tax expense (or benefit) in the income statement. Currently, excess tax benefits are recorded in additional paid-in-capital in the balance sheet. In the statement of cash flows, the new guidance requires both excess tax benefits and employee tax withholdings to be presented as operating inflows rather than as financing inflows. ASU No. 2016-09 is effective for annual and interim periods beginning after December 15, 2016. We are still assessing the potential impact that ASU No. 2016-09 will have on our financial statements and disclosures, but we believe that, during periods when our stock price increases, it will generally result in (1) a decrease to our income tax expense and effective tax rate and (2) an increase to our cash flows from operating activities.