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Investments, Investments Portfolio and AFS Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2015
Jul. 25, 2014
Apr. 24, 2015
Trading securities:      
Aggregate carrying amount of investments in equity and other securities that are accounted for using the cost or equity method $ 497   $ 520
Cost method, equity method, and other investments:      
Short-term and long-term investments, cost 15,836   15,312
Short-term and long-term investments, unrealized gains 127   224
Short-term and long-term investments, unrealized losses (299)   (193)
Short-term and long-term investments, fair value 15,167   14,823
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 5,957   2,941
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (177)   (141)
More than 12 months, fair value 1,393   1,171
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (122)   (52)
Available for Sale Securities      
Available-for-sale securities:      
Available-for-sale securities, cost 40   64
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 22   35
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (1)   (19)
Available-for-sale securities, fair value 61   80
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 4   4
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (1)   (19)
More than 12 months, fair value 0   0
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss 0   0
Corporate Debt Securities      
Available-for-sale securities:      
Available-for-sale securities, cost 6,579   6,283
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 54   105
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (32)   (10)
Available-for-sale securities, fair value 6,601   6,378
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 2,677   944
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (29)   (9)
More than 12 months, fair value 71   34
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (3)   (1)
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 (7)   (4)
Available-for-sale securities, fair value 102   105
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 0   0
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss 0   0
More than 12 months, fair value 102   105
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (7)   (4)
Mortgage Backed Securities      
Available-for-sale securities:      
Available-for-sale securities, cost 1,543   1,462
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 14   22
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (13)   (6)
Available-for-sale securities, fair value 1,544   1,478
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 642   346
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (9)   (3)
More than 12 months, fair value 242   206
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (4)   (3)
US Government and Agency Securities      
Available-for-sale securities:      
Available-for-sale securities, cost 3,249   3,122
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 10   21
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (10)   (4)
Available-for-sale securities, fair value 3,249   3,139
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 958   356
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (7)   (1)
More than 12 months, fair value 263   267
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (3)   (3)
Foreign Government and Agency Securities      
Available-for-sale securities:      
Available-for-sale securities, cost 63   85
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 63   85
Certificates of Deposit      
Available-for-sale securities:      
Available-for-sale securities, cost 45   44
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 45   44
Other Asset-backed Securities      
Available-for-sale securities:      
Available-for-sale securities, cost 500   504
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 2   3
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax 0   0
Available-for-sale securities, fair value 502   507
Debt Funds [Member]      
Available-for-sale securities:      
Available-for-sale securities, cost 3,149   3,061
Available-For-Sale Securities, Accumulated Gross Unrealized Gain, Before Tax 8   19
Available-For-Sale Securities, Accumulated Gross Unrealized Loss, Before Tax (236)   (150)
Available-for-sale securities, fair value 2,921   2,930
AFS Continuous Unrealized Loss Position      
Less than 12 months, fair value 1,676   1,291
Available-For-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Accumulated Loss (131)   (109)
More than 12 months, fair value 715   559
Available-For-Sale Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Accumulated Loss (105)   (41)
Exchange Traded Funds      
Trading securities:      
Trading securities, cost 62   58
Trading securities, unrealized gains 17   19
Trading securities, unrealized losses 0   0
Trading securities, fair value 79   77
Debt Securities      
AFS Gross Realized Gain (Loss)      
Proceeds from sales 1,237 $ 1,830  
Gross realized gains 5 11  
Gross realized losses (5) (3)  
Impairment losses recognized 0 0  
Equity Securities      
AFS Gross Realized Gain (Loss)      
Proceeds from sales 29 23  
Gross realized gains 12 19  
Gross realized losses 0 0  
Impairment losses recognized (23) $ (1)  
Nonrecurring      
Trading securities:      
Aggregate carrying amount of investments in equity and other securities that are accounted for using the cost or equity method $ 497   $ 520