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Intangible Assets Acquired Through Business Combinations and Goodwill (Expected Future Amortization Expense for Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Fiscal 2021 $ 1,059  
Fiscal 2022 984  
Fiscal 2023 833  
Fiscal 2024 750  
Fiscal 2025 513  
Thereafter 585  
Total amortization expense $ 4,724 $ 1,923