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Leases - Schedule of Future Payments (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Jul. 31, 2020
Operating Lease Maturity    
2021 (excluding the six months ended January 31, 2021) $ 38  
2022 88  
2023 81  
2024 77  
2025 60  
Thereafter 156  
Total future minimum lease payments 500  
Less imputed interest (37)  
Present value of lease liabilities 463 $ 267
Sublease Income Maturity    
Remainder of fiscal year 2021 7  
2022 10  
2023 3  
2024 2  
2025 $ 1