Net Revenues - Summary of Disaggregated Net Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,649	$ 978	$ 3,120	$ 1,781
United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,026	879	1,894	1,595
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	479	99	934	186
France [Member]
Disaggregation of Revenue [Line Items]
Net revenues	144		292
Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,146	512	2,220	978
Safety Services [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	534	422	1,008	805
Safety Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	468	90	920	173
Safety Services [Member] | France [Member]
Disaggregation of Revenue [Line Items]
Net revenues	144		292
Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	518	476	930	820
Specialty Services [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	507	467	916	807
Specialty Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net revenues	11	9	14	13
Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(15)	(10)	(30)	(17)
Corporate and Eliminations [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(15)	(10)	(30)	(17)
Life Safety [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,007	403	1,958	771
Life Safety [Member] | Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	1,007	403	1,958	771
Mechanical [Member]
Disaggregation of Revenue [Line Items]
Net revenues	139	109	262	207
Mechanical [Member] | Safety Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	139	109	262	207
Infrastructure/Utility [Member]
Disaggregation of Revenue [Line Items]
Net revenues	366	265	508	430
Infrastructure/Utility [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	366	265	508	430
Fabrication [Member]
Disaggregation of Revenue [Line Items]
Net revenues	53	58	107	139
Fabrication [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	53	58	107	139
Specialty Contracting [Member]
Disaggregation of Revenue [Line Items]
Net revenues	99	153	315	251
Specialty Contracting [Member] | Specialty Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	99	153	315	251
Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	(15)	(10)	(30)	(17)
Corporate and Eliminations [Member] | Corporate and Eliminations [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ (15)	$ (10)	$ (30)	$ (17)