Employee Benefit Plans (Weighted Average Assumptions Used to Determine Benefit Obligation for Defined Benefit Pension and Other Postretirement Plans) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.80%	3.70%
Rate of compensation increase	2.60%	1.20%
Return on plan assets assumption	5.40%	5.40%	5.40%
Impact on Net Periodic Pension Expense - Next Twelve Months	$ 13
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	3.30%	4.40%
Rate of compensation increase	2.50%	1.50%
Return on plan assets assumption	7.40%
International
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.20%	2.90%
Rate of compensation increase	2.80%	0.90%