Costs Associated with Exit and Restructuring Activities - Rollforward of Exit and Restructuring Accrual (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Balance at beginning of year	$ 8	$ 10	$ 15
Charged to earnings	11	16	19
Cash paid	(14)	(18)	(22)
WLAN Divestiture	0	0	(2)
Balance at the end of year	$ 5	$ 8	$ 10