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Employee Benefits - Pension and Other Post-Retirement Benefits (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Components of net periodic pension expense (credit):      
Interest cost $ 4,000,000 $ 5,000,000 $ 6,000,000
Amortization of past-service liability 0    
Expected return on plan assets (16,000,000) (15,000,000) (14,000,000)
Amortization of net actuarial loss 7,000,000 7,000,000 10,000,000
Net periodic pension (credit) expense (5,000,000) (3,000,000) 2,000,000
Post-Retirement Benefits      
Components of net periodic pension expense (credit):      
Service cost 0 0 0
Interest cost 0 0 0
Amortization of past-service liability 0 (0) (0)
Amortization of net actuarial loss 0 0 0
Net periodic pension (credit) expense $ 0 $ 0 $ 0