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Leases - Lessee Arrangements, Maturities of Operating Leases (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Jul. 25, 2020
Leases [Abstract]    
2022 $ 355  
2023 279  
2024 195  
2025 127  
2026 70  
Thereafter 219  
Total lease payments 1,245  
Less interest (77)  
Total operating lease liabilities $ 1,168 $ 1,002