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Business Combinations - Summary of Fair Value of Identifiable Intangible Assets (Detail) - APi Acquisition [Member]
$ in Millions
Oct. 01, 2019
USD ($)
Indefinite Lived Intangible Assets By Major Class [Line Items]  
Total intangibles $ 1,110
Contractual Backlog [Member]  
Indefinite Lived Intangible Assets By Major Class [Line Items]  
Total intangibles 99
Customer Relationships [Member]  
Indefinite Lived Intangible Assets By Major Class [Line Items]  
Total intangibles 752
Tradenames and Trademarks [Member]  
Indefinite Lived Intangible Assets By Major Class [Line Items]  
Total intangibles $ 259