Summary of Dividends Declared and Paid (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended					12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 26, 2015
Dividends [Line Items]
Dividend Per Share	$ 0.52	$ 0.52	$ 0.52	$ 0.47	$ 0.47	$ 1.98
Amount	$ 2,898	$ 2,950	$ 2,997	$ 2,734	$ 2,750	$ 11,431