Employee Benefit Plans (Weighted Average Assumptions Used to Determine Benefit Obligation for Defined Benefit Pension and Other Postretirement Plans) (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.10%	2.80%
Rate of compensation increase	1.50%	2.60%
Return on plan assets assumption	5.00%	5.40%	5.40%
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.40%	3.30%
Rate of compensation increase	2.50%	2.50%
Return on plan assets assumption	7.40%
International
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	1.60%	2.20%
Rate of compensation increase	1.10%	2.80%