Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Operating lease cost		$ 35	$ 34	$ 7
Finance lease cost - amortization of right-of-use assets		2	1
Short-term lease cost		26	28	9
Variable lease cost		6	4	1
Total lease cost		$ 69	$ 67	$ 17
APi Group Corp Predecessor [Member]
Lessee Lease Description [Line Items]
Operating lease cost	$ 26
Short-term lease cost	20
Variable lease cost	5
Total lease cost	$ 51