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Leases (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Lessee, Lease, Description [Line Items]      
Operating Lease, Right-of-Use Asset $ 149,000,000 $ 177,000,000  
Finance Lease, Right-of-Use-Asset, after Accumulated Amortization 729,000,000 572,000,000  
Total lease assets $ 878,000,000 $ 749,000,000  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current  
Current Finance Lease Liability $ 80,000,000 $ 56,000,000  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities  
Total lease liabilities $ 931,000,000 $ 796,000,000  
Operating Lease, Cost 77,000,000 69,000,000 $ 56,000,000
Variable Lease, Cost 258,000,000 134,000,000 78,000,000
Short-term Lease, Cost 10,000,000 18,000,000 26,000,000
Finance Lease, Right-of-Use Asset, Amortization 79,000,000 57,000,000 58,000,000
Finance Lease, Interest Expense 37,000,000 43,000,000 42,000,000
Total finance lease costs 116,000,000 100,000,000 100,000,000
Lease, Cost 461,000,000 321,000,000 $ 260,000,000
Operating lease under PPA 121,000,000 135,000,000  
Finance Lease, Liability, Noncurrent 700,000,000 576,000,000  
Leases      
Finance lease under PPA 550,000,000 $ 390,000,000  
New PPAs with battery storage $ 991,000,000