Costs Associated with Exit and Restructuring Activities (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Rollforward of Exit and Restructuring Accruals

A rollforward of the exit and restructuring accruals is as follows (in millions):

	Year Ended December 31,
	2018			2017			2016
Balance at beginning of year	$	8		$	10		$	15
Charged to earnings	11			16			19
Cash paid	(14		)	(18		)	(22		)
WLAN Divestiture	—			—			(2		)
Balance at the end of year	$	5		$	8		$	10