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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2016
May. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Excess tax benefits $ 17  
Increase in net cash provided by operations 247 $ 1,611
Increase in net cash required for financing activities $ 22 (747)
Accounting Standards Update 2016-09, Statutory Tax Withholding Component | New Accounting Pronouncement, Early Adoption, Effect    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Increase in net cash provided by operations   60
Increase in net cash required for financing activities   $ 60