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Calculation of Net Earnings Per (Loss) Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
Earnings Per Share [Line Items]
Net income from continuing operations	$ 330	$ 42	$ 624	$ 60
Loss from discontinued operations, net of tax	(286)	(36)	(324)	(67)
Net income (loss)	$ 44	$ 6	$ 300	$ (7)
Weighted-average shares outstanding	535	548	545	546
Basic earnings (loss) per share:
Continuing operations	$ 0.62	$ 0.08	$ 1.15	$ 0.11
Discontinued operations	(0.54)	(0.07)	(0.60)	(0.12)
Net earnings (loss)	$ 0.08	$ 0.01	$ 0.55	$ (0.01)
Net income from continuing operations	$ 330	$ 42	$ 624	$ 60
Loss from discontinued operations, net of tax	(286)	(36)	(324)	(67)
Net income (loss)	$ 44	$ 6	$ 300	$ (7)
Weighted-average shares outstanding	535	548	545	546
Stock options and restricted stock	10	8	8	9
Diluted weighted-average shares outstanding	545	556	553	555
Diluted earnings (loss) per share
Continuing operations	$ 0.61	$ 0.08	$ 1.13	$ 0.11
Discontinued operations	(0.54)	(0.07)	(0.60)	(0.12)
Net earnings (loss)	$ 0.08	$ 0.01	$ 0.54	$ (0.01)

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