Components of Long Term Debt (Detail) (USD $)	Oct. 27, 2012	Jan. 28, 2012	Oct. 29, 2011	Oct. 27, 2012 Senior Notes Due 2017	Jan. 28, 2012 Senior Notes Due 2017	Oct. 29, 2011 Senior Notes Due 2017	Oct. 27, 2012 Senior Notes Due 2021	Jan. 28, 2012 Senior Notes Due 2021	Oct. 29, 2011 Senior Notes Due 2021	Oct. 27, 2012 Senior Notes Due 2023	Jan. 28, 2012 Senior Notes Due 2023	Oct. 29, 2011 Senior Notes Due 2023	Oct. 27, 2012 Senior Notes Due 2029	Jan. 28, 2012 Senior Notes Due 2029	Oct. 29, 2011 Senior Notes Due 2029	Oct. 27, 2012 Senior Notes Due 2033	Jan. 28, 2012 Senior Notes Due 2033	Oct. 29, 2011 Senior Notes Due 2033	Oct. 27, 2012 Senior Notes Due 2037	Jan. 28, 2012 Senior Notes Due 2037	Oct. 29, 2011 Senior Notes Due 2037	Oct. 27, 2012 Senior Notes [Member] Senior Notes Due 2023	Sep. 30, 2012 Senior Notes [Member] Senior Notes Due 2023
Debt Instrument [Line Items]
Effective Rate	5.63%	6.01%	6.01%	6.31%	6.31%	6.31%	4.81%	4.81%	4.81%	3.25%	0.00%	0.00%	7.36%	7.36%	7.36%	6.05%	6.05%	6.05%	6.89%	6.89%	6.89%
Total senior debt	$ 2,500,000,000	$ 2,150,000,000	$ 2,150,000,000	$ 650,000,000	$ 650,000,000	$ 650,000,000	$ 650,000,000	$ 650,000,000	$ 650,000,000	$ 350,000,000	$ 0	$ 0	$ 200,000,000	$ 200,000,000	$ 200,000,000	$ 300,000,000	$ 300,000,000	$ 300,000,000	$ 350,000,000	$ 350,000,000	$ 350,000,000
Unamortized debt discount	(8,000,000)	(9,000,000)	(9,000,000)
Long-term debt	2,492,000,000	2,141,000,000	2,141,000,000
Debt issued																						$ 350,000,000
Debt instrument, interest rate																							3.25%