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Investments , Investments Portfolio and AFS Continuous Unrealized Loss Position (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 25, 2014
Apr. 26, 2013
Apr. 27, 2012
Cost method, equity method, and other investments:      
Cost and Equity Method Investment without Quoted Market Price $ 666 $ 549  
Short-term and long-term investments, cost 13,659 10,896  
Short-term and long-term investments, unrealized gains 108 185  
Short-term and long-term investments, unrealized losses (108) (27)  
Short-term and long-term investments, fair value 12,993 10,505  
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 5,032 1,044  
Less than 12 months, unrealized losses (90) (5)  
More than 12 months, fair value 221 160  
More than 12 months, unrealized losses (18) (22)  
AFS OTTI Losses      
Total OTTI losses recognized     6
OTTI losses recognized in OCI     4
OTTI losses recognized in earnings     2
Salient and PEAK
     
Business Acquisition [Line Items]      
Gain on previously held investments     38
Available for Sale Securities
     
Available-for-sale securities:      
Available-for-sale securities, cost 47 82  
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 15 75  
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (13) (2)  
Available-for-sale securities, fair value 49 155  
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 25 14  
Less than 12 months, unrealized losses (13) (2)  
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 5,504 4,587  
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 55 78  
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (17) (4)  
Available-for-sale securities, fair value 5,542 4,661  
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 1,601 544  
Less than 12 months, unrealized losses (14) (1)  
More than 12 months, fair value 50 13  
More than 12 months, unrealized losses (3) (3)  
Auction Rate Securities
     
Available-for-sale securities:      
Available-for-sale securities, cost 109 118  
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 0 0  
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (12) (15)  
Available-for-sale securities, fair value 97 103  
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 97 103  
More than 12 months, unrealized losses (12) (15)  
Mortgage Backed Securities
     
Available-for-sale securities:      
Available-for-sale securities, cost 1,337 1,050  
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 7 8  
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (8) (5)  
Available-for-sale securities, fair value 1,336 1,053  
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 682 195  
Less than 12 months, unrealized losses (7) (1)  
More than 12 months, fair value 28 44  
More than 12 months, unrealized losses (1) (4)  
US Government and Agency Securities
     
Available-for-sale securities:      
Available-for-sale securities, cost 3,138 3,882  
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 7 17  
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (29) (1)  
Available-for-sale securities, fair value 3,116 3,898  
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 1,500 291  
Less than 12 months, unrealized losses (27) (1)  
More than 12 months, fair value 46 0  
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (2)    
More than 12 months, unrealized losses   0  
Foreign Government and Agency Securities
     
Available-for-sale securities:      
Available-for-sale securities, cost 67 38  
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 67 38  
Certificates of Deposit
     
Available-for-sale securities:      
Available-for-sale securities, cost 54 6  
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 54 6  
Asset-backed Securities [Member]
     
Available-for-sale securities:      
Available-for-sale securities, cost 540 539  
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 2 2  
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax 0 0  
Available-for-sale securities, fair value 542 541  
Debt funds
     
Available-for-sale securities:      
Available-for-sale securities, cost 2,143    
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 9    
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (29)    
Available-for-sale securities, fair value 2,123    
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 1,224    
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (29)    
More than 12 months, fair value 0    
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss 0    
Exchange Traded Funds
     
Trading securities:      
Trading securities, cost 54 45  
Trading securities, unrealized gains 13 5  
Trading securities, unrealized losses 0 0  
Trading securities, fair value 67 50  
Debt Securities
     
AFS Gross Realized Gain (Loss)      
Proceeds from sales 7,991 [1] 10,350 [1] 7,675 [1]
Gross realized gains 15 [1] 59 [1] 52 [1]
Gross realized losses (12) [1] (17) [1] (16) [1]
Impairment losses recognized (1) [1] 0 [1] (2) [1]
Equity Securities
     
AFS Gross Realized Gain (Loss)      
Proceeds from sales 120 [2] 161 [2] 113 [2],[3]
Gross realized gains 69 [2] 94 [2] 93 [2],[3]
Gross realized losses 0 [2] 0 [2] 0 [2],[3]
Impairment losses recognized $ (9) [2] $ (21) [2] $ (10) [2],[3]
[1] Includes available-for-sale debt securities.
[2] Includes marketable equity securities, cost method, equity method, exchange-traded funds, and other investments.
[3] As a result of the Salient and PEAK acquisitions that occurred during fiscal year 2012, the Company recognized a non-cash gain of $38 million on its previously-held minority investments.