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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Receive Hedge Accounting Treatment (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Summary of Derivative Instruments That Receive Hedge Accounting Treatment |  |  |
Interest rate swaps | $ 698 | $ 840 |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | 14 |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 3 | 48 | $ 42
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax | 1 | $ 25 | $ 99
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | $ 0 |  |

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