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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 31, 2016
Jan. 25, 2015
Jan. 26, 2014
Stock based compensation      
Cost of revenue $ 15 $ 12 $ 11
Research and development 115 88 83
Sales, general and administrative 74 58 42
Stock-based compensation expense $ 204 $ 158 $ 136
Summary of equity awards granted      
Stock Options granted (in shares) 0 0 6
Estimated total grant-date fair value of stock options $ 0 $ 0 $ 21
Weighted average grant-date fair value per option $ 0.00 $ 0.00 $ 3.47
RSUs, PSUs and Market-based PSUs, granted (in shares) 13 13 11
Estimated total grant-date fair value of RSUs, PSUs and Market-based PSUs $ 296 $ 228 $ 145
Weighted average grant date fair value, RSUs, PSUs, and Market-based PSUs, granted $ 22.01 $ 17.68 $ 13.46
Shares purchased under ESPP 6 7 6
Weighted Average Price (Per Share), ESPP $ 13.67 $ 10.99 $ 10.79
Weighted average grant date fair value of ESPP $ 4.53 $ 4.99 $ 5.60
Share Based Compensation Expense Related To Equity Awards Not Expected To Vest $ 46 $ 37 $ 30
Summary of unearned SBC expense      
Unearned stock-based compensation expense $ 381 $ 291  
Stock Options      
Summary of unearned SBC expense      
Estimated weighted average amortization period 1 year 1 month 6 days 1 year 9 months 18 days  
Fair Value Assumptions      
Expected life, minimum     2 years 4 months 24 days
Expected life, maximum     3 years 6 months
Risk free interest rate, minimum     1.80%
Risk free interest rate, maximum     3.00%
Volatility rate, minimum     28.00%
Volatility rate, maximum     37.00%
Dividend yield minimum     1.90%
Dividend Yield maximum     2.40%
RSUs, PSUs and Market-based PSUs      
Summary of unearned SBC expense      
Estimated weighted average amortization period 2 years 8 months 12 days 2 years 9 months 17 days  
Employee Stock Purchase Plan      
Summary of unearned SBC expense      
Estimated weighted average amortization period 8 months 12 days 6 months  
Fair Value Assumptions      
Expected life, minimum 6 months 6 months 6 months
Expected life, maximum 2 years 2 years 2 years
Risk free interest rate, minimum 0.10% 0.10% 0.10%
Risk free interest rate, maximum 0.70% 0.50% 0.40%
Volatility rate, minimum 24.00% 23.00% 32.00%
Volatility rate, maximum 34.00% 31.00% 37.00%
Dividend yield minimum 1.50% 1.70% 2.00%
Dividend Yield maximum 1.80% 1.90% 2.40%