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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts Related to Open Derivative Contracts | The following table summarizes by derivative type the gross notional amounts related to open derivative contracts at September 30, 2025 and 2024 and the final settlement dates of the Company's open derivative contracts as of September 30, 2025, but excluding those derivatives that qualified for the NPNS exception:
|  |  |  |  |  | Notional Amounts (in millions)
|  |  |  |  |  | September 30,
Type |  | Units |  | Settlements Extending Through |  | 2025 |  | 2024
Commodity Price Risk: |  |  |  |  |  |  |  |
Regulated Utility Operations |  |  |  |  |  |  |  |
PA Gas Utility NYMEX natural gas futures and option contracts |  | Dekatherms |  | September 2026 |  | 28 |  |  | 26 |
Non-utility Operations |  |  |  |  |  |  |  |
LPG swaps |  | Gallons |  | May 2028 |  | 608 |  |  | 458 |
Natural gas futures, forward, basis swap, options and pipeline contracts |  | Dekatherms |  | December 2029 |  | 237 |  |  | 325 |
Electricity forward and futures contracts |  | Kilowatt hours |  | December 2028 |  | 929 |  |  | 1,113 |
Interest Rate Risk: |  |  |  |  |  |  |  |
Interest rate swaps |  | Euro |  | March 2026 |  | € | 300 |  |  | € | 300 |
Interest rate swaps |  | USD |  | September 2028 |  | $ | 1,443 |  |  | $ | 1,231 |
Foreign Currency Exchange Rate Risk: |  |  |  |  |  |  |  |
Forward foreign currency exchange contracts |  | USD |  | September 2028 |  | $ | 500 |  |  | $ | 389 |
Net investment hedge forward foreign exchange contracts |  | Euro |  | December 2026 |  | € | 106 |  |  | € | 181 |
Schedule of Derivative Assets, Liabilities and the Effects of Offsetting | The following table presents the Company’s derivative assets and liabilities by type, as well as the effects of offsetting, as of September 30:
| 2025 |  | 2024
Derivative assets: |  |  |
Derivatives designated as hedging instruments: |  |  |
Foreign currency contracts | $ | 1 |  |  | $ | 6 |
Interest rate contracts | — |  |  | 1 |
| 1 |  |  | 7 |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | 3 |  |  | 4 |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts | 93 |  |  | 129 |
Total derivative assets – gross | 97 |  |  | 140 |
Gross amounts offset in the balance sheet | (65) |  |  | (88) |
Cash collateral received | (2) |  |  | (14) |
Total derivative assets – net (a) | $ | 30 |  |  | $ | 38 |
Derivative liabilities: |  |  |
Derivatives designated as hedging instruments: |  |  |
Interest rate contracts | $ | (12) |  |  | $ | (22) |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | (8) |  |  | (1) |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts | (125) |  |  | (151) |
Foreign currency contracts | (19) |  |  | (9) |
| (144) |  |  | (160) |
Total derivative liabilities – gross | (164) |  |  | (183) |
Gross amounts offset in the balance sheet | 65 |  |  | 88 |
Cash collateral pledged | 19 |  |  | 36 |
Total derivative liabilities – net | $ | (80) |  |  | $ | (59) |
(a) Derivative assets with maturities over one year are included in “Other assets” on the Consolidated Balance Sheets.
Schedule of Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest | The following tables provide information on the effects of derivative instruments on the Consolidated Statements of Income and changes in AOCI for Fiscal 2025, Fiscal 2024 and Fiscal 2023:
| Gain (Loss) Recognized in AOCI |  | Gain (Loss) Reclassified from AOCI into Income |  | Location of Gain (Loss) Reclassified from AOCI into Income
| 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts | $ | 14 |  |  | $ | (19) |  |  | $ | 25 |  |  | $ | 3 |  |  | $ | 49 |  |  | $ | 40 |  |  | Interest expense
Net Investment Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | (9) |  |  | $ | (5) |  |  | $ | (21) |  |  |  |  |  |  |  |  |
| Gain (Loss) Recognized in Income |  | Location of Gain (Loss) Recognized in Income |
| 2025 |  | 2024 |  | 2023 |
Derivatives Not Designated as Hedging Instruments: |  |  |  |  |  |  |  |
Commodity contracts | $ | (1) |  |  | $ | 1 |  |  | $ | 11 |  |  | Revenues |
Commodity contracts | 3 |  |  | (92) |  |  | (1,771) |  |  | Cost of sales |
Commodity contracts | (1) |  |  | 3 |  |  | 2 |  |  | Other operating expense (income), net |
Foreign currency contracts | (4) |  |  | (19) |  |  | (23) |  |  | Other non-operating income (expense), net |
Total | $ | (3) |  |  | $ | (107) |  |  | $ | (1,781) |  |  |  |

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