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Business Combinations - Summary of Preliminary Fair Value of Consideration of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
2020 Acquisitions [Member]    
Business Acquisition [Line Items]    
Cash paid at closing   $ 329
Accrued consideration   5
Total consideration   334
Cash   10
Current assets   76
Property and equipment   12
Goodwill   215
Other noncurrent assets   14
Current liabilities   (54)
Noncurrent liabilities   (38)
Net assets acquired   334
2020 Acquisitions [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Intangible assets other then goodwill   82
2020 Acquisitions [Member] | Trade names and Trademarks [Member]    
Business Acquisition [Line Items]    
Intangible assets other then goodwill   16
2020 Acquisitions [Member] | Contractual Backlog [Member]    
Business Acquisition [Line Items]    
Intangible assets other then goodwill   $ 1
Premier Fire [Member]    
Business Acquisition [Line Items]    
Cash paid at closing $ 32  
Accrued consideration 7  
Total consideration 39  
Cash 3  
Current assets 10  
Property and equipment 1  
Intangible assets other then goodwill 13  
Goodwill 17  
Current liabilities (5)  
Noncurrent liabilities  
Net assets acquired 39  
Other 2021 Acquisitions [Member]    
Business Acquisition [Line Items]    
Cash paid at closing 23  
Accrued consideration 6  
Total consideration 29  
Cash 1  
Current assets 5  
Property and equipment 2  
Intangible assets other then goodwill 5  
Goodwill 18  
Current liabilities (2)  
Noncurrent liabilities  
Net assets acquired $ 29