Fair Value Measurements (Details) (USD $) In Millions	Apr. 29, 2011	Jan. 28, 2011
Derivative instruments	$ 60	$ 27
Total assets	12,209	12,073
Derivative instruments	159	28
Total liabilities	159	28
Money Market Funds [Member]
Cash Equivalents	9,579	6,261
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	9,579	6,261
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	0	0
Commercial Paper [Member]
Cash Equivalents	1,390	2,945
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	0	0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	1,390	2,945
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	0	0
US Government Corporations and Agencies Securities [Member]
Cash Equivalents	16	1,699
Securities	27	79
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	0	0
Securities	0	0
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	16	1,699
Securities	27	79
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	0	0
Securities	0	0
Domestic Corporate Debt Securities [Member]
Securities	558	496
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities	0	0
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities	524	464
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities	34	32
Foreign Corporate Debt Securities [Member]
Securities	466	457
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities	0	0
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities	466	457
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities	0	0
Equity Securities [Member]
Securities	113	109
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities	113	109
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member]
Derivative instruments	0	0
Total assets	9,579	6,261
Derivative instruments	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Derivative instruments	60	27
Total assets	2,596	5,780
Derivative instruments	159	28
Total liabilities	159	28
Fair Value, Inputs, Level 3 [Member]
Derivative instruments	0	0
Total assets	34	32
Derivative instruments	0	0
Total liabilities	$ 0	$ 0