Shareholders' Equity - Summary of Dividends Declared and Paid (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 24, 2016
Equity [Abstract]
Dividend per share (in dollars per share)	$ 0.57	$ 0.57	$ 0.57	$ 0.52	$ 0.52	$ 2.18
Dividend amount	$ 3,042	$ 3,071	$ 3,117	$ 2,879	$ 2,898	$ 11,965