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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, 2022
Jan. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]    
Fiscal 2023 $ 1,931  
Fiscal 2024 1,844  
Fiscal 2025 1,573  
Fiscal 2026 1,340  
Fiscal 2027 978  
Thereafter 1,312  
Total amortization expense $ 8,978 $ 4,114