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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - Utilities - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Regulatory Assets [Line Items] |  |
Regulatory assets | $ 347 | $ 340
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 366 | 335
Postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 12 | 11
Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 55 | 3
State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 43 | 38
Excess federal deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 254 | 279
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 2 | 4
Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 94 | 83
Underfunded pension plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 111 | 114
Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 28 | 37
Deferred fuel and power costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 27 | 32
Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 23 | 22
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 64 | $ 52

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