Shareholders' Equity - Accelerated Share Repurchase Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Thousands	2 Months Ended	3 Months Ended			6 Months Ended	7 Months Ended	12 Months Ended
	Jun. 25, 2016	Jun. 25, 2016	Dec. 26, 2015	Jul. 31, 2015	Apr. 30, 2016	Feb. 28, 2015	Dec. 31, 2014
May 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date	2016-08
Number of shares repurchased (in shares)	48,183
ASR amount	$ 6,000,000,000
November 2015 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date					2016-04
Number of shares repurchased (in shares)		8,700	20,400		29,122
Average repurchase price per share (in USD per share)					$ 103.02
ASR amount					$ 3,000,000,000
May 2015 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date				2015-07
Number of shares repurchased (in shares)				48,293
Average repurchase price per share (in USD per share)				$ 124.24
ASR amount				$ 6,000,000,000
August 2014 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date						2015-02
Number of shares repurchased (in shares)						81,525
Average repurchase price per share (in USD per share)						$ 110.40
ASR amount						$ 9,000,000,000
January 2014 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date							2014-12
Number of shares repurchased (in shares)							134,247
Average repurchase price per share (in USD per share)							$ 89.39
ASR amount							$ 12,000,000,000