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Intangible Assets Acquired Through Business Combinations and Goodwill (Expected Future Amortization Expense for Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Jul. 31, 2019
Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Remaining six months of Fiscal 2020 $ 228  
Fiscal 2021 429  
Fiscal 2022 366  
Fiscal 2023 218  
Fiscal 2024 152  
Thereafter 332  
Total amortization expense $ 1,725 $ 1,923