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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Oct. 29, 2018
USD ($)
Oct. 14, 2018
USD ($)
Dec. 31, 2020
USD ($)
ReportingUnit
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Number of reporting units | ReportingUnit     2      
Trademark license agreement     40 years      
Advertising costs     $ 25,000,000 $ 46,000,000    
Compensation expense related to employer contributions     $ 18,000,000 18,000,000    
Defined benefit plan net actuarial gains and losses in excess of fair value of plan assets or plan's projected benefit obligation percentage     10.00%      
Aggregate lease, liability     $ 140,000,000     $ 115,000,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]           rezi:AccruedAndOtherCurrentLiabilitiesMember
Right-of-use asset     133,000,000 137,000,000   $ 112,000,000
Tax Matters Agreement            
Summary Of Significant Accounting Policies [Line Items]            
Indemnity outstanding amount     139,000,000 149,000,000    
Selling, General and Administrative Expenses            
Summary Of Significant Accounting Policies [Line Items]            
Research and development expense     77,000,000 87,000,000 $ 59,000,000  
Honeywell            
Summary Of Significant Accounting Policies [Line Items]            
Indemnity liability annual cap     $ 140,000,000 $ 140,000,000 $ 140,000,000  
Honeywell | Indemnification and Reimbursement Agreement            
Summary Of Significant Accounting Policies [Line Items]            
Indemnification payable percentage of payments 90.00% 90.00%        
Indemnification payable percentage of net insurance receipts 90.00% 90.00%        
Indemnification payable percentage of net proceeds received 90.00% 90.00%        
Trademarks | Honeywell | Selling, General and Administrative Expenses            
Summary Of Significant Accounting Policies [Line Items]            
Royalty fee percentage of net revenue     1.50%      
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Intangible assets, useful life     3 years      
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Intangible assets, useful life     15 years      
Maximum | Indemnification and Reimbursement Agreement            
Summary Of Significant Accounting Policies [Line Items]            
Indemnity liability annual cap $ 140,000,000          
Maximum | Honeywell | Indemnification and Reimbursement Agreement            
Summary Of Significant Accounting Policies [Line Items]            
Indemnity liability annual cap   $ 140,000,000        
Buildings and Improvements | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, plant and equipment, estimated useful lives     10 years      
Buildings and Improvements | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, plant and equipment, estimated useful lives     50 years      
Machinery and Equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, plant and equipment, estimated useful lives     3 years      
Machinery and Equipment | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, plant and equipment, estimated useful lives     16 years      
Tooling Equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, plant and equipment, estimated useful lives     3 years      
Tooling Equipment | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, plant and equipment, estimated useful lives     10 years