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Employee Benefit Plans - Summary of Changes in Fair Value of Pension Plan Level 3 Assets (Detail) - Insurance contracts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at January 1	$ 8	$ 8
Purchases, sales and settlements, net	(1)	0
Fair value of plan assets at December 31	$ 7	$ 8

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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