Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended			9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 15, 2014	Jun. 24, 2014	Feb. 05, 2013	Sep. 26, 2014	Sep. 27, 2013	Oct. 20, 2014 Subsequent Event [Member]	Sep. 26, 2014 Common Stock [Member]	Sep. 27, 2013 Common Stock [Member]
Class of Stock [Line Items]
Amount of shares authorized to be repurchased			$ 1,500,000,000
Average price per share of repurchased shares				$ 115.91
Number of common shares repurchased							3.6	4.8
Aggregate amount of repurchased shares				413,000,000	404,000,000
Remaining value under share repurchase program				455,000,000
Cash dividend, declared per share		$ 0.60				$ 0.60
Total cash dividends	$ 51,000,000			$ 155,000,000	$ 149,000,000
Dividend declared date				Oct. 20, 2014
Dividend payable date				Dec. 15, 2014
Dividend payable, record date				Nov. 17, 2014