Restructuring (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Employee
2014 T15 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	240
Restructuring and Related Cost, Number of Positions Eliminated	100
Restructuring and Related Cost, Expected Cost | $	$ 10
2015 Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	70
Restructuring and Related Cost, Number of Positions Eliminated	35
Restructuring and Related Cost, Expected Cost | $	$ 8