Restructuring (Narrative) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) Employee
2014 T15 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	565
Restructuring and Related Cost, Number of Positions Eliminated	425
Restructuring and Related Cost, Expected Cost | $	$ 2
2015 Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	125
Restructuring and Related Cost, Number of Positions Eliminated	110
Restructuring and Related Cost, Expected Cost | $	$ 2