Payable to Clients - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Payable To Clients [Abstract]
Interest percentage paid on client credits	0.01%	0.01%	0.35%
Total interest paid to clients	$ 2	$ 9	$ 62