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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - Utilities - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 412 | $ 397 | $ 395
Regulatory Liabilities |  |  |
Regulatory liabilities | 346 | 388 | 346
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 13 | 13 | 13
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 1 | 36 | 24
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 33 | 32 | 28
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 285 | 287 | 272
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 14 | 20 | 9
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 145 | 143 | 126
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 106 | 108 | 172
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 57 | 58 | 59
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 29 | 11 | 0
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 23 | 24 | 24
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 52 | $ 53 | $ 14

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