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, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Return on plan assets assumption	6.10%	6.10%	6.50%
Impact on Net Periodic Pension Expense - Next Twelve Months	$ 11
Discount rate used to calculate benefit obligation	3.70%	4.10%
Rate of compensation increase	1.60%	2.00%
Pensions
Defined Benefit Plan Disclosure [Line Items]
Impact on Net Periodic Pension Expense - Next Twelve Months	$ 28
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Impact on Net Periodic Pension Expense - Next Twelve Months	$ 24
United States and Canada
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	4.30%	4.50%