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Long-Term Obligations and Commitments - Operating Lease Commitments and Unconditional Purchase Obligations (Details)
$ in Millions
Jul. 31, 2021
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2022 $ 205
2023 147
2024 68
2025 58
2026 53
Thereafter 0
Total commitments $ 531