Restructuring (Narrative) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) Employee
2014 T15 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	420
Restructuring and Related Cost, Number of Positions Eliminated	350
Restructuring and Related Cost, Expected Cost | $	$ 7
2015 Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	105
Restructuring and Related Cost, Number of Positions Eliminated	90
Restructuring and Related Cost, Expected Cost | $	$ 3