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Other Balance Sheet Accounts - Schedule of Other Assets (Detail) - USD ($)
$ in Millions
Apr. 30, 2018
Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Deferred income taxes, noncurrent, net $ 39 $ 36
Long-term deposits 23 24
Domain names and patents, net 815 827
Customer contract assets 138 159
Other 171 142
Other assets, net 392 384
Domain names and patents, net    
Finite-Lived Intangible Assets [Line Items]    
Domain names and patents, net $ 21 $ 23