Fair Value Measurements (Fair Value Measured on Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Oct. 28, 2011	Apr. 29, 2011
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Aggregate carrying amount of equity and other securities without a quoted market price and accounted for using the cost or equity method	$ 831	$ 656
Aggregate carrying amount of intangible assets	2,875	2,777
Goodwill	9,944	9,537
Recurring [Member] | Fair Value [Member]
Assets:
Corporate debt securities	2,523	1,961
Auction rate securities	127	133
Mortgage-backed securities	931	785
U.S. government and agency securities	2,885	2,756
Foreign Government and agency securities	91	131
Certificates of deposit	97	119
Other asset-backed securities	438	349
Marketable equity securities	164	237
Exchange-traded funds	44	39
Derivative assets	177	130
Total assets	7,477	6,640
Liabilities:
Derivative liabilities	190	303
Total liabilities	190	303
Recurring [Member] | Level 1 [Member]
Assets:
Corporate debt securities	0	0
Auction rate securities	0	0
Mortgage-backed securities	0	0
U.S. government and agency securities	1,556	1,453
Foreign Government and agency securities	0	0
Certificates of deposit	0	0
Other asset-backed securities	0	0
Marketable equity securities	164	237
Exchange-traded funds	44	39
Derivative assets	41	21
Total assets	1,805	1,750
Liabilities:
Derivative liabilities	180	303
Total liabilities	180	303
Recurring [Member] | Level 2 [Member]
Assets:
Corporate debt securities	2,513	1,944
Auction rate securities	0	0
Mortgage-backed securities	900	750
U.S. government and agency securities	1,329	1,303
Foreign Government and agency securities	91	131
Certificates of deposit	97	119
Other asset-backed securities	432	343
Marketable equity securities	0	0
Exchange-traded funds	0	0
Derivative assets	136	109
Total assets	5,498	4,699
Liabilities:
Derivative liabilities	10	0
Total liabilities	10	0
Recurring [Member] | Level 3 [Member]
Assets:
Corporate debt securities	10	17
Auction rate securities	127	133
Mortgage-backed securities	31	35
U.S. government and agency securities	0	0
Foreign Government and agency securities	0	0
Certificates of deposit	0	0
Other asset-backed securities	6	6
Marketable equity securities	0	0
Exchange-traded funds	0	0
Derivative assets	0	0
Total assets	174	191
Liabilities:
Derivative liabilities	0	0
Total liabilities	$ 0	$ 0