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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, 2021
Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Fiscal 2022 $ 1,078  
Fiscal 2023 923  
Fiscal 2024 835  
Fiscal 2025 568  
Fiscal 2026 342  
Thereafter 368  
Total amortization expense $ 4,114 $ 4,724