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Common Stock and Stockholders' Equity - Narrative (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Mar. 25, 2015
shares
Mar. 31, 2014
shares
Jan. 31, 2014
USD ($)
$ / shares
shares
Oct. 31, 2012
shares
Jan. 31, 2016
USD ($)
vote / shares
$ / shares
shares
Jan. 31, 2015
USD ($)
$ / shares
shares
Jan. 31, 2014
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Conversion of Common Stock into Class B Common Stock, shares       42,000,000      
Stock Options Exercised Liability Recorded | $         $ 3 $ 4  
Employee Stock Purchase Plan (ESPP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share reserve increased, shares 2,000,000            
Common stock available for future grants, shares         5,000,000    
Percentage of fair market value of stock at which employees are granted shares         85.00%    
Weighted-average purchase price, dollars per share | $ / shares         $ 67.16    
Cash proceeds | $         $ 34    
Class B Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Conversion of Preferred Stock into common stock, shares       98,000,000      
Common stock outstanding, shares         79,000,000 83,000,000  
Common stock, votes per share | vote / shares         10    
Percent of shares of common stock less than 9% of the outstanding shares         9.00%    
Duration of time after death of Co-Founders until shares are converted, months         9 months    
Class A Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock shares issued, shares     7,000,000        
Offering price per share, in dollars per share | $ / shares     $ 89.00       $ 89.00
Net proceeds from shares | $     $ 592        
Underwriting discounts and commissions | $     21        
Other offering expenses | $     $ 1        
Common stock outstanding, shares         116,000,000 105,000,000  
Common stock, votes per share | vote / shares         1    
Class A Common Stock | 2012 Equity Incentive Plan (EIP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share reserve increased, shares 9,000,000 9,000,000          
Common stock available for future grants, shares         54,000,000    
Class A Common Stock | Employee Stock Purchase Plan (ESPP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares purchased by employees, shares         500,000    
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum exercise period, years         10 years    
Vesting period, years         5 years    
Total grant-date fair value of stock options vested | $         $ 17 $ 20 $ 27
Total intrinsic value of the options exercised | $         $ 279 311 566
Weighted-average remaining contractual life of vested and expected to vest options, years         5 years 2 months 12 days    
Unrecognized compensation cost | $         $ 17    
Weighted-average period to be recognized, years         1 year 3 months 18 days    
Weighted-average remaining contractual life of exercisable options, years         5 years    
Weighted-average remaining contractual life of outstanding options, years         5 years 2 months 12 days    
Restricted Stock Units (RSU)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period, years         4 years    
Total grant-date fair value of stock options vested | $         $ 162 $ 90 $ 4
Weighted-average period to be recognized, years         2 years 9 months 18 days    
Weighted average grant date fair value (in dollars per share) | $ / shares         $ 85.29 $ 81.65 $ 71.35
Unrecognized compensation cost | $         $ 611    
Outstanding, weighted average grant date fair value (dollars per share) | $ / shares         $ 81.48 $ 76.93  
Restricted stock awards vested, shares         1,959,862    
Restricted stock awards vested, weighted average grant fair value (dollars per share) | $ / shares         $ 77.21    
Number of shares granted, shares (less than)         5,307,070    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period, years         5 years    
Weighted-average period to be recognized, years         1 year 9 months 18 days    
Unrecognized compensation cost | $         $ 6    
Outstanding, weighted average grant date fair value (dollars per share) | $ / shares         $ 12.98    
Restricted stock awards vested, shares         300,000    
Restricted stock awards vested, weighted average grant fair value (dollars per share) | $ / shares         $ 12.73    
Restricted Stock | Class B Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock outstanding, shares         500,000    
Performance Based Restricted Stock Unit (PRSU)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average period to be recognized, years         2 months    
Weighted average grant date fair value (in dollars per share) | $ / shares         $ 76.45    
Unrecognized compensation cost | $         $ 2    
Number of shares granted, shares (less than)         100,000.0