Organization, Consolidation and Presentation of Financial Statements	12 Months Ended
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization, Operations and Basis of Presentation	Note 1. Organization, Operations and Basis of Presentation Business Description Resideo Technologies, Inc. (“Resideo” or “the Company”), is a global provider of products, software, solutions and technologies that help owners of homes stay connected and in control of their comfort, security and energy use. The Company is a leader in the home heating, ventilation and air conditioning controls and security markets, and a leading global distributor of security and fire protection products. Separation from Honeywell The Company was incorporated in Delaware on April 24, 2018. The Company separated from Honeywell International Inc. (“Honeywell”) on October 29, 2018, becoming an independent publicly traded company as a result of a pro rata distribution of the Company’s common stock to shareholders of Honeywell ( “Spin-Off”). Exhibit 99.1 to Amendment No. 2 to the Company’s Registration Statement on Form 10 as filed with the Securities and Exchange Commission (“SEC”) on October 2, 2018 (the “Form 10”) was declared effective by the SEC on October 3, 2018. On October 29, 2018 (“Spin-Off Date”), Honeywell’s shareholders of record as of October 16, 2018 ( “Record Date”) received one share of the Company’s common stock, par value $0.001 per share, for every six shares of Honeywell’s common stock, par value $1.00 per share, held as of the Record Date, and cash for any fractional shares of the Company’s common stock. The Company began trading “regular way” under the ticker symbol “REZI” on the New York Stock Exchange on October 29, 2018. In connection with the separation, Resideo and Honeywell entered into a Separation and Distribution Agreement, an Employee Matters Agreement, a Tax Matters Agreement, a Transaction Services Agreement, a Trademark License Agreement and a Patent Cross-License Agreement. The agreements govern the relationship between Resideo and Honeywell following the separation and provide for the allocation of various assets, liabilities, rights and obligations. These agreements also include arrangements for transition services to be provided by Honeywell to Resideo and by Resideo to Honeywell. Basis of Presentation The Consolidated Balance Sheet as of December 31, 2018 consists of the consolidated balances of Resideo as prepared on a stand-alone basis. The Combined Balance Sheet as of December 31, 2017, and Consolidated and Combined Statements of Operations, Comprehensive Income (Loss), Equity, and Cash Flows for the years ended December 31, 2018, 2017 and 2016, have been prepared on a “carve-out” basis for the periods and dates prior to the Spin-Off and include stand-alone results for the period subsequent to the date of Spin-Off. Prior to the separation, these Consolidated and Combined Financial Statements were derived from the consolidated financial statements and accounting records of Honeywell. These Consolidated and Combined Financial Statements reflect the Company’s consolidated historical financial position, results of operations and cash flows as they have been historically managed in conformity with Generally Accepted Accounting Principles in the United States (“U.S. GAAP”). All intracompany transactions have been eliminated for all periods presented. As described in Note 5. Related Party Transactions with Honeywell, all significant transactions between the Company and Honeywell occurring prior to the Spin-Off have been included in these Consolidated and Combined Financial Statements. Prior to the Spin-Off, transactions between the Company and Honeywell were reflected in the Consolidated and Combined Balance Sheet as Due from related parties, current or Due to related parties, current. In the Consolidated and Combined Statements of Cash Flows, the cash flows related to related party notes receivables presented in the Consolidated and Combined Balance Sheet in Due from related parties, current are reflected as investing activities since these balances represent amounts loaned to Honeywell. The cash flows related to related party notes payables presented in the Combined Balance Sheet in Due to related parties, current are reflected as financing activities since these balances represent amounts financed by Honeywell. While the Company was owned by Honeywell, a centralized approach to cash management and financing was used. Prior to the consummation of the Spin-Off, the majority of the Company’s cash was transferred to Honeywell daily and Honeywell funded the Company’s operating and investing activities as needed. Cash transfers to and from Honeywell’s cash management accounts are reflected in the Combined Balance Sheet as Due to and Due from related parties, current and in the Consolidated and Combined Statements of Cash Flows as net financing activities. The Combined Financial Statements prior to the Spin-Off include certain assets and liabilities that have historically been held at the Honeywell corporate level but were specifically identifiable or otherwise attributable to the Company. The cash and cash equivalents held by Honeywell at the corporate level were not specifically identifiable to the Company and therefore were not attributed for any of the periods presented. Honeywell third-party debt and the related interest expense were not allocated for any of the periods presented as Honeywell’s borrowings were not directly attributable to the Company. Prior to the consummation of the Spin-Off, Honeywell provided certain services, such as legal, accounting, information technology, human resources and other infrastructure support, on behalf of the Company. The cost of these services has been allocated to the Company on the basis of the proportion of net revenue. The Company and Honeywell consider these allocations to be a reasonable reflection of the benefits received by the Company. However, the financial information presented in these Consolidated and Combined Financial Statements may not reflect the consolidated and combined financial position, operating results and cash flows of the Company had the Company been a separate stand-alone entity during the periods presented. Actual costs that would have been incurred if the Company had been a stand-alone company would depend on multiple factors, including organizational structure and strategic decisions made in various areas, including information technology and infrastructure. Both Resideo and Honeywell consider the basis on which the expenses have been allocated to be a reasonable reflection of the utilization of services provided to or the benefits received by the Company during the periods presented. After the Spin-Off, a number of the above services have continued under a transition service agreement with Honeywell, which the Company will expense as incurred based on the contractual pricing terms.

Organization, Consolidation and Presentation of Financial Statements

12 Months Ended

Dec. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization, Operations and Basis of Presentation

Note 1. Organization, Operations and Basis of Presentation

Business Description

Resideo Technologies, Inc. (“Resideo” or “the Company”), is a global provider of products, software, solutions and technologies that help owners of homes stay connected and in control of their comfort, security and energy use. The Company is a leader in the home heating, ventilation and air conditioning controls and security markets, and a leading global distributor of security and fire protection products.

Separation from Honeywell

The Company was incorporated in Delaware on April 24, 2018. The Company separated from Honeywell International Inc. (“Honeywell”) on October 29, 2018, becoming an independent publicly traded company as a result of a pro rata distribution of the Company’s common stock to shareholders of Honeywell ( “Spin-Off”). Exhibit 99.1 to Amendment No. 2 to the Company’s Registration Statement on Form 10 as filed with the Securities and Exchange Commission (“SEC”) on October 2, 2018 (the “Form 10”) was declared effective by the SEC on October 3, 2018. On October 29, 2018 (“Spin-Off Date”), Honeywell’s shareholders of record as of October 16, 2018 ( “Record Date”) received one share of the Company’s common stock, par value $0.001 per share, for every six shares of Honeywell’s common stock, par value $1.00 per share, held as of the Record Date, and cash for any fractional shares of the Company’s common stock. The Company began trading “regular way” under the ticker symbol “REZI” on the New York Stock Exchange on October 29, 2018.

In connection with the separation, Resideo and Honeywell entered into a Separation and Distribution Agreement, an Employee Matters Agreement, a Tax Matters Agreement, a Transaction Services Agreement, a Trademark License Agreement and a Patent Cross-License Agreement. The agreements govern the relationship between Resideo and Honeywell following the separation and provide for the allocation of various assets, liabilities, rights and obligations. These agreements also include arrangements for transition services to be provided by Honeywell to Resideo and by Resideo to Honeywell.

Basis of Presentation

The Consolidated Balance Sheet as of December 31, 2018 consists of the consolidated balances of Resideo as prepared on a stand-alone basis. The Combined Balance Sheet as of December 31, 2017, and Consolidated and Combined Statements of Operations, Comprehensive Income (Loss), Equity, and Cash Flows for the years ended December 31, 2018, 2017 and 2016, have been prepared on a “carve-out” basis for the periods and dates prior to the Spin-Off and include stand-alone results for the period subsequent to the date of Spin-Off. Prior to the separation, these Consolidated and Combined Financial Statements were derived from the consolidated financial statements and accounting records of Honeywell. These Consolidated and Combined Financial Statements reflect the Company’s consolidated historical financial position, results of operations and cash flows as they have been historically managed in conformity with Generally Accepted Accounting Principles in the United States (“U.S. GAAP”).

All intracompany transactions have been eliminated for all periods presented. As described in Note 5. Related Party Transactions with Honeywell, all significant transactions between the Company and Honeywell occurring prior to the Spin-Off have been included in these Consolidated and Combined Financial Statements.

Prior to the Spin-Off, transactions between the Company and Honeywell were reflected in the Consolidated and Combined Balance Sheet as Due from related parties, current or Due to related parties, current. In the Consolidated and Combined Statements of Cash Flows, the cash flows related to related party notes receivables presented in the Consolidated and Combined Balance Sheet in Due from related parties, current are reflected as investing activities since these balances represent amounts loaned to Honeywell. The cash flows related to related party notes payables presented in the Combined Balance Sheet in Due to related parties, current are reflected as financing activities since these balances represent amounts financed by Honeywell.

While the Company was owned by Honeywell, a centralized approach to cash management and financing was used. Prior to the consummation of the Spin-Off, the majority of the Company’s cash was transferred to Honeywell daily and Honeywell funded the Company’s operating and investing activities as needed. Cash transfers to and from Honeywell’s cash management accounts are reflected in the Combined Balance Sheet as Due to and Due from related parties, current and in the Consolidated and Combined Statements of Cash Flows as net financing activities.

The Combined Financial Statements prior to the Spin-Off include certain assets and liabilities that have historically been held at the Honeywell corporate level but were specifically identifiable or otherwise attributable to the Company. The cash and cash equivalents held by Honeywell at the corporate level were not specifically identifiable to the Company and therefore were not attributed for any of the periods presented. Honeywell third-party debt and the related interest expense were not allocated for any of the periods presented as Honeywell’s borrowings were not directly attributable to the Company.

Prior to the consummation of the Spin-Off, Honeywell provided certain services, such as legal, accounting, information technology, human resources and other infrastructure support, on behalf of the Company. The cost of these services has been allocated to the Company on the basis of the proportion of net revenue. The Company and Honeywell consider these allocations to be a reasonable reflection of the benefits received by the Company. However, the financial information presented in these Consolidated and Combined Financial Statements may not reflect the consolidated and combined financial position, operating results and cash flows of the Company had the Company been a separate stand-alone entity during the periods presented. Actual costs that would have been incurred if the Company had been a stand-alone company would depend on multiple factors, including organizational structure and strategic decisions made in various areas, including information technology and infrastructure. Both Resideo and Honeywell consider the basis on which the expenses have been allocated to be a reasonable reflection of the utilization of services provided to or the benefits received by the Company during the periods presented. After the Spin-Off, a number of the above services have continued under a transition service agreement with Honeywell, which the Company will expense as incurred based on the contractual pricing terms.