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Leases Future Operating Lease Payments (Details) - USD ($)
$ in Millions
Apr. 30, 2022
Apr. 30, 2021
Leases [Abstract]    
2023 $ 22  
2024 18  
2025 13  
2026 9  
2027 7  
Thereafter 10  
Total lease payments 79  
Less: Present value discount (4)  
Lease liabilities $ 75 $ 69