Calculation of Net Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Basic Earnings Per Share
Net income from continuing operations	$ 19	$ 21	$ 52	$ 95
Income from discontinued operations, net of tax	(3)	3	5	45
Net income	$ 16	$ 24	$ 57	$ 140
Weighted-average shares outstanding	557	518	556	517
Continuing operations	$ 0.03	$ 0.04	$ 0.09	$ 0.18
Discontinued operations		0.01	0.01	0.09
Net basic earnings per common share	$ 0.03	$ 0.05	$ 0.10	$ 0.27
Diluted Earnings Per Share
Net income from continuing operations	$ 19	$ 21	$ 52	$ 95
Income from discontinued operations, net of tax	(3)	3	5	45
Net income	$ 16	$ 24	$ 57	$ 140
Weighted-average shares outstanding	557	518	556	517
Stock options and restricted stock	8	14	8	15
Diluted weighted-average shares outstanding	565	532	564	532
Continuing operations	$ 0.03	$ 0.04	$ 0.09	$ 0.18
Discontinued operations		0.01	0.01	0.08
Net diluted earnings per common share	$ 0.03	$ 0.05	$ 0.10	$ 0.26