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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 28, 2022 | Nov. 09, 2021 | Apr. 01, 2021 | Feb. 08, 2021 | Oct. 08, 2020 | Jan. 28, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Regulatory Assets |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  | $ 341 | $ 185 |
Gas Utility |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  | $ 21 | $ 1 | $ 35
Gas Utility | PAPUC |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Requested rate increase | $ 83 |  |  |  |  | $ 75 |  |  |
Approved rate increase |  |  |  |  | $ 20 |  |  |  |
Property, plant and equipment, net threshold |  |  | $ 2,875 |  |  |  |  |  |
Amortization period |  |  | 10 years |  |  |  |  |  |
Gas Utility | PAPUC | Beginning January 1, 2021 |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  | 10 |  |  |  |
Gas Utility | PAPUC | Beginning July 1, 2021 |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  | $ 10 |  |  |  |
Electric Utility | PAPUC |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Requested rate increase |  |  |  | $ 9 |  |  |  |  |
Electric Utility | PAPUC | Joint Petition |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Requested rate increase |  | $ 6 |  |  |  |  |  |  |

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- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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