Pensions And Other Postemployment Benefits (Assumed Health Care And Drug Cost Trend Rates Used To Measure Next Year's Postemployment Healthcare Benefits) (Detail) - Other Postemployment Benefits [Member] - Health Care [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Trend rate	6.97%	7.25%
Ultimate trend rate	5.00%	5.00%
Year ultimate trend rate reached	2022	2022