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Leases (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Lessee, Lease, Description [Line Items]      
Operating Lease, Right-of-Use Asset $ 177,000,000 $ 155,000,000  
Finance Lease, Right-of-Use-Asset, after Accumulated Amortization 572,000,000 630,000,000  
Total lease assets 749,000,000 785,000,000  
Operating Lease, Liability, Current 71,000,000    
Operating Lease, Liability, Noncurrent 93,000,000 93,000,000  
Finance Lease, Liability, Noncurrent 576,000,000 628,000,000  
Total lease liabilities 796,000,000 839,000,000  
Operating Lease, Cost 69,000,000 56,000,000 $ 52,000,000
Variable Lease, Cost 134,000,000 78,000,000 75,000,000
Short-term Lease, Cost 18,000,000 26,000,000 12,000,000
Finance Lease, Right-of-Use Asset, Amortization 57,000,000 58,000,000 51,000,000
Finance Lease, Interest Expense 43,000,000 42,000,000 39,000,000
Total finance lease costs 100,000,000 100,000,000 90,000,000
Lease, Cost $ 321,000,000 $ 260,000,000 $ 229,000,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current  
Operating lease under PPA $ 135,000,000 $ 133,000,000  
Leases      
Finance lease under PPA $ 390,000,000 425,000,000  
Operating lease liability      
Lessee, Lease, Description [Line Items]      
Accounts Payable and Accrued Liabilities   $ 59,000,000