Debt Obligations and Commitments - Additional Information (Detail) (USD $)		3 Months Ended
	Sep. 08, 2012	Jun. 16, 2012 Extended Unsecured Revolving Credit Agreement Ending June 2016 [Member]	Jun. 16, 2012 Extended Unsecured Revolving Credit Agreement Ending June 2013 [Member]	Mar. 24, 2012 0.750% Senior Notes Due 2015 [Member]	Mar. 24, 2012 2.750% Senior Notes Due 2022 [Member]	Mar. 24, 2012 4.000% Senior Notes Due 2042 [Member]	Sep. 08, 2012 0.700% Senior Notes Due 2015 [Member]	Sep. 08, 2012 1.250% Senior Notes Due 2017 [Member]	Sep. 08, 2012 3.600% Senior Notes Due 2042 [Member]
Debt Instrument [Line Items]
Fixed and floating rate notes issued				$ 750,000,000	$ 1,250,000,000	$ 750,000,000	$ 900,000,000	$ 1,000,000,000	$ 600,000,000
Interest rate on debt				0.75%	2.75%	4.00%	0.70%	1.25%	3.60%
Debt instrument, term of agreement		4 years	364 days
Commercial paper outstanding	$ 900,000,000