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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, 2022 | Sep. 30, 2021
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Regulatory Assets [Line Items] |  |
Regulatory assets | $ 340 | $ 397
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 335 | 388
Postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 11 | 13
Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 3 | 36
State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 38 | 32
Excess federal deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 279 | 287
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 4 | 20
Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 83 | 143
Underfunded pension plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 114 | 108
Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 37 | 58
Deferred fuel and power costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 32 | 11
Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 22 | 24
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 52 | $ 53

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