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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 |  |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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