Pension and Other Benefit Plans - Weighted-Average Assumed Discount Rate, Compensation Increases and Expected Long-Term Rate of Return on Plan Assets Used to Determine Net Pension Cost for US and International Plans (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.60%	3.30%
US
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.30%	4.30%	3.70%
Compensation increases	4.00%	4.00%	4.00%
Return on plan assets	6.60%	6.60%	7.25%
International
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.27%	4.00%	3.55%
Compensation increases	4.82%	4.83%	4.81%
Return on plan assets	6.71%	7.22%	7.40%