Accelerated Share Repurchase (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						1 Months Ended		12 Months Ended	1 Months Ended
	Jan. 29, 2012		Jan. 30, 2011		Jan. 31, 2010		Mar. 31, 2012 Accelerated Share Repurchase Agreement [Member]	Mar. 31, 2011 Accelerated Share Repurchase Agreement [Member]	Jan. 29, 2012 Accelerated Share Repurchase Agreement [Member]	Mar. 31, 2012 Repurchase of Equity [Member] Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Cash paid for repurchase of common stock	$ 3,470	[1]	$ 2,608	[1]	$ 213	[1]	$ 1,000	$ 1,000		$ 1,000
Number of shares of common stock repurchased pursuant to accelerated share repurchase agreement									27	17
Treasury Stock, value	$ 6,694		$ 3,193						$ 1,000

[1] Fiscal years ended January 29, 2012, January 30, 2011 and January 31, 2010 include 52 weeks.