Equity - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended			1 Months Ended
	Sep. 28, 2012	Sep. 28, 2012	Sep. 30, 2011	Apr. 26, 2011	Oct. 24, 2012 Subsequent Event [Member]
Additional amount of shares authorized to be repurchased				$ 1,500,000,000
Average price per share of repurchased shares	$ 73.06	$ 69.83
Number of common shares repurchased	1,019,790	7,200,000
Aggregate amount of repurchased shares	75,000,000	504,000,000	800,000,000
Remaining value under share repurchase program	$ 630,000,000	$ 630,000,000
Cash dividend, declared per share					$ 0.50