Benefit Plans - Actual Overall Asset Allocation for U.S. And Non-U.S. Plans as Compared to Investment Policy Goals (Detail)	Dec. 31, 2018	Dec. 31, 2017
Fixed income
Plan Assets
Asset allocation	87.00%	98.00%
Target Allocation
Asset allocation	95.00%	97.00%
Other securities
Plan Assets
Asset allocation	5.00%	2.00%
Target Allocation
Asset allocation	5.00%	3.00%
Cash
Plan Assets
Asset allocation	8.00%	0.00%
Target Allocation
Asset allocation	0.00%	0.00%