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Stock-Based Compensation - Summary of Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 27, 2019
Jan. 28, 2018
Jan. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) [1],[2] 4    
Weighted average grant date fair value (in dollars per share) $ 258.26    
Shares purchased (in shares) 1 5 4
Summary of unearned SBC expense      
Aggregate unearned stock-based compensation expense $ 1,580 $ 1,091  
RSUs, PSUs and Market-based PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 4 6 12
Estimated total grant-date fair value $ 1,109 $ 929 $ 591
Weighted average grant date fair value (in dollars per share) $ 258.26 $ 145.91 $ 50.57
Summary of unearned SBC expense      
Estimated weighted average amortization period 2 years 2 months 2 years 3 months 7 days  
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value (in dollars per share) $ 38.51 $ 7.12 5.80
Weighted average price (in dollars per share) $ 107.48 $ 21.24 $ 18.51
Summary of unearned SBC expense      
Estimated weighted average amortization period 9 months 29 days 8 months 6 days  
Fair Value Assumptions      
Risk free interest rate, minimum 1.60% 0.80% 0.50%
Risk free interest rate, maximum 2.80% 1.40% 0.90%
Volatility rate, minimum 24.00% 40.00% 30.00%
Volatility rate, maximum 75.00% 54.00% 39.00%
Employee Stock Purchase Plan | Minimum      
Fair Value Assumptions      
Weighted average expected life (in years) 1 month 6 months 6 months
Dividend yield 0.30% 0.30% 0.70%
Employee Stock Purchase Plan | Maximum      
Fair Value Assumptions      
Weighted average expected life (in years) 2 years 2 years 2 years
Dividend yield 0.40% 0.50% 1.40%
[1] Includes PSUs that will be issued and eligible to vest based on the corporate financial performance level achieved for fiscal year 2019.
[2] Includes market-based PSUs that will be issued and eligible to vest if the maximum target for total shareholder return, or TSR, over the 3-year measurement period is achieved. Depending on the ranking of our TSR compared to the respective TSRs of the companies comprising the Standard & Poor’s 500 Index during that period, the market-based PSUs issued could be up to 45 thousand shares.