Costs Associated with Exit and Restructuring - Liabilities and Expenses Related to Exit and Restructuring Activities (Detail) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Balance at beginning of year	$ 15	$ 7		$ 7
Charged to earnings	19	40	$ 6	65	$ 46
Cash paid	(22)	(32)
WLAN divestiture	(2)	0
Balance at the end of year	$ 10	$ 15	$ 7	$ 10	$ 15