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Marketable Securities (Details)
$ in Millions
12 Months Ended
Jan. 31, 2016
USD ($)
Jan. 25, 2015
USD ($)
Jan. 26, 2014
USD ($)
Classified as:      
Cash equivalents $ 232 $ 295  
Marketable securities 4,441 4,126  
Estimated Fair Value $ 4,673 4,421  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 9    
Available-for-sale Securities, Amortized Cost $ 4,672 4,413  
Available-for-sale Debt Securities, Unrealized Gain 6 11  
Available-for-sale Debt Securities, Unrealized Loss (5) (3)  
Net realized gain 2   $ 2
Available For Sale Securities Net Unrealized Gain Loss   8  
Amortized Cost Basis      
Less than one year 1,619 1,570  
Due in 1-5 years 3,019 2,720  
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date 34 123  
Total 4,672 4,413  
Estimated Fair Value      
Less than one year 1,619 1,570  
Due in 1-5 years 3,020 2,726  
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date 34 125  
Total 4,673 4,421  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,739    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 111    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,850    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses      
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months (5)    
Available-for-sale Securities, Gross Unrealized Losses,12 Months or Longer 0    
Available-for-sale Securities, Gross Unrealized Losses (5)    
Corporate Debt Securities      
Classified as:      
Estimated Fair Value 1,901 2,186  
Available-for-sale Securities, Amortized Cost 1,903 2,185  
Available-for-sale Debt Securities, Unrealized Gain 1 3  
Available-for-sale Debt Securities, Unrealized Loss (3) (2)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 950    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 80    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,030    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses      
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months (3)    
Available-for-sale Securities, Gross Unrealized Losses,12 Months or Longer 0    
Available-for-sale Securities, Gross Unrealized Losses (3)    
US Government Agencies Debt Securities      
Classified as:      
Estimated Fair Value 1,170 750  
Available-for-sale Securities, Amortized Cost 1,170 750  
Available-for-sale Debt Securities, Unrealized Gain 1 0  
Available-for-sale Debt Securities, Unrealized Loss (1) 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 692    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 692    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses      
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months (1)    
Available-for-sale Securities, Gross Unrealized Losses,12 Months or Longer 0    
Available-for-sale Securities, Gross Unrealized Losses (1)    
US Treasury Securities      
Classified as:      
Estimated Fair Value 801 537  
Available-for-sale Securities, Amortized Cost 800 534  
Available-for-sale Debt Securities, Unrealized Gain 1 3  
Available-for-sale Debt Securities, Unrealized Loss 0 0  
Asset-backed Securities      
Classified as:      
Estimated Fair Value 435 453  
Available-for-sale Securities, Amortized Cost 435 453  
Available-for-sale Debt Securities, Unrealized Gain 0 0  
Available-for-sale Debt Securities, Unrealized Loss 0 0  
Mortgage backed securities issued by United Sates government-sponsored enterprises      
Classified as:      
Estimated Fair Value 231 278  
Available-for-sale Securities, Amortized Cost 229 274  
Available-for-sale Debt Securities, Unrealized Gain 3 5  
Available-for-sale Debt Securities, Unrealized Loss (1) (1)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 97    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 31    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 128    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses      
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months (1)    
Available-for-sale Securities, Gross Unrealized Losses,12 Months or Longer 0    
Available-for-sale Securities, Gross Unrealized Losses (1)    
Money Market Funds      
Classified as:      
Estimated Fair Value 43 132  
Available-for-sale Securities, Amortized Cost 43 132  
Available-for-sale Debt Securities, Unrealized Gain 0 0  
Available-for-sale Debt Securities, Unrealized Loss 0 0  
Foreign Government Debt      
Classified as:      
Estimated Fair Value 92 85  
Available-for-sale Securities, Amortized Cost 92 85  
Available-for-sale Debt Securities, Unrealized Gain 0 0  
Available-for-sale Debt Securities, Unrealized Loss $ 0 $ 0