Employee Benefit Plans - Major Actuarial Assumptions Used in Determining PBO, ABO and Net Periodic Cost (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Retirement Plans
Weighted-average assumptions used to determine benefit obligations
Discount Rate	4.36%	4.00%
Rate of Compensation Increase	3.69%	3.99%
Weighted-average assumptions used to determine net periodic benefit cost
Discount Rate	4.00%	4.78%	3.90%
Expected long-term rate of return	7.67%	7.66%	7.65%
Rate of Compensation Increase	3.99%	3.99%	4.29%
Retiree Health and Life Insurance Plans
Weighted-average assumptions used to determine benefit obligations
Discount Rate	3.78%	3.52%
Rate of Compensation Increase	3.36%	3.42%
Weighted-average assumptions used to determine net periodic benefit cost
Discount Rate	3.52%	4.03%	3.16%
Expected long-term rate of return	7.39%	7.39%	7.42%
Rate of Compensation Increase	3.42%	3.44%	3.51%
Foreign Plans
Weighted-average assumptions used to determine benefit obligations
Discount Rate	3.71%	3.49%
Rate of Compensation Increase	3.52%	3.51%
Weighted-average assumptions used to determine net periodic benefit cost
Discount Rate	3.49%	4.51%	4.36%
Expected long-term rate of return	4.92%	5.57%	5.57%
Rate of Compensation Increase	3.51%	3.80%	3.46%