Calculation of Net Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 30, 2017	Sep. 24, 2016
Earnings Per Share [Line Items]
Net income from continuing operations	$ 98	$ 330	$ 195	$ 624
Income (loss) from discontinued operations, net of tax	(6)	(137)	38	(175)
Net income	$ 92	$ 193	$ 233	$ 449
Weighted-average shares outstanding	518	535	517	545
Basic earnings (loss) per share:
Continuing operations	$ 0.19	$ 0.62	$ 0.38	$ 1.15
Discontinued operations	(0.01)	(0.26)	0.07	(0.32)
Net earnings per share	$ 0.18	$ 0.36	$ 0.45	$ 0.82
Net income from continuing operations	$ 98	$ 330	$ 195	$ 624
Income (loss) from discontinued operations, net of tax	(6)	(137)	38	(175)
Net income	$ 92	$ 193	$ 233	$ 449
Weighted-average shares outstanding	518	535	517	545
Stock options and restricted stock	13	10	15	8
Diluted weighted-average shares outstanding	531	545	532	553
Diluted earnings (loss) per share
Continuing operations	$ 0.19	$ 0.61	$ 0.37	$ 1.13
Discontinued operations	(0.01)	(0.25)	0.07	(0.32)
Net diluted earnings per share	$ 0.17	$ 0.35	$ 0.44	$ 0.81