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Investments , Investments Portfolio and AFS Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 24, 2015
Apr. 25, 2014
Cost method, equity method, and other investments:    
Cost and Equity Method Investment without Quoted Market Price $ 520 $ 666
Short-term and long-term investments, cost 15,312 13,659
Short-term and long-term investments, unrealized gains 224 108
Short-term and long-term investments, unrealized losses (193) (108)
Short-term and long-term investments, fair value 14,823 12,993
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 2,941 5,032
Less than 12 months, unrealized losses (141) (90)
More than 12 months, fair value 1,171 221
More than 12 months, unrealized losses (52) (18)
NGC and Visualase    
AFS Continuous Unrealized Loss Position    
Non-cash gain on previously-held minority investments 41  
Available for Sale Securities    
Available-for-sale securities:    
Available-for-sale securities, cost 64 47
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 35 15
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (19) (13)
Available-for-sale securities, fair value 80 49
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 4 25
Less than 12 months, unrealized losses (19) (13)
More than 12 months, fair value 0 0
More than 12 months, unrealized losses 0 0
Corporate Debt Securities    
Available-for-sale securities:    
Available-for-sale securities, cost 6,283 5,504
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 105 55
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (10) (17)
Available-for-sale securities, fair value 6,378 5,542
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 944 1,601
Less than 12 months, unrealized losses (9) (14)
More than 12 months, fair value 34 50
More than 12 months, unrealized losses (1) (3)
Auction Rate Securities    
Available-for-sale securities:    
Available-for-sale securities, cost 109 109
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 0 0
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (4) (12)
Available-for-sale securities, fair value 105 97
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized losses 0 0
More than 12 months, fair value 105 97
More than 12 months, unrealized losses (4) (12)
Mortgage Backed Securities    
Available-for-sale securities:    
Available-for-sale securities, cost 1,462 1,337
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 22 7
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (6) (8)
Available-for-sale securities, fair value 1,478 1,336
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 346 682
Less than 12 months, unrealized losses (3) (7)
More than 12 months, fair value 206 28
More than 12 months, unrealized losses (3) (1)
US Government and Agency Securities    
Available-for-sale securities:    
Available-for-sale securities, cost 3,122 3,138
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 21 7
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (4) (29)
Available-for-sale securities, fair value 3,139 3,116
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 356 1,500
Less than 12 months, unrealized losses (1) (27)
More than 12 months, fair value 267 46
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (3)  
More than 12 months, unrealized losses   (2)
Foreign Government and Agency Securities    
Available-for-sale securities:    
Available-for-sale securities, cost 85 67
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 0 0
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax 0 0
Available-for-sale securities, fair value 85 67
Certificates of Deposit    
Available-for-sale securities:    
Available-for-sale securities, cost 44 54
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 0 0
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax 0 0
Available-for-sale securities, fair value 44 54
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, cost 504 540
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 3 2
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax 0 0
Available-for-sale securities, fair value 507 542
Debt funds    
Available-for-sale securities:    
Available-for-sale securities, cost 3,061 2,143
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 19 9
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (150) (29)
Available-for-sale securities, fair value 2,930 2,123
AFS Continuous Unrealized Loss Position    
Less than 12 months, fair value 1,291 1,224
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (109) (29)
More than 12 months, fair value 559 0
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (41) 0
Exchange Traded Funds    
Trading securities:    
Trading securities, cost 58 54
Trading securities, unrealized gains 19 13
Trading securities, unrealized losses 0 0
Trading securities, fair value $ 77 $ 67