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Derivative Instruments and Hedging Activities (Tables) | 6 Months Ended
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Mar. 31, 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 March 31, 2025, September 30, 2024 and March 31, 2024, and the final settlement dates of the Company's open derivative contracts as of March 31, 2025, but excluding those derivatives that qualified for the NPNS exception:
|  |  |  |  |  | Notional Amounts (in millions)
Type |  | Units |  | Settlements Extending Through |  | March 31, 2025 |  | September 30, 2024 |  | March 31, 2024
Commodity Price Risk: |  |  |  |  |  |  |  |  |  |
Regulated Utility Operations |  |  |  |  |  |  |  |  |  |
PA Gas Utility NYMEX natural gas futures and option contracts |  | Dekatherms |  | February 2026 |  | 18 |  |  | 26 |  |  | 13 |
Non-utility Operations |  |  |  |  |  |  |  |  |  |
LPG swaps |  | Gallons |  | September 2027 |  | 414 |  |  | 458 |  |  | 425 |
Natural gas futures, forward, basis swap, options and pipeline contracts |  | Dekatherms |  | March 2029 |  | 266 |  |  | 325 |  |  | 339 |
Electricity forward and futures contracts |  | Kilowatt hours |  | December 2027 |  | 842 |  |  | 1,113 |  |  | 544 |
Interest Rate Risk: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | Euro |  | March 2026 |  | € | 300 |  |  | € | 300 |  |  | € | 300 |
Interest rate swaps |  | USD |  | September 2027 |  | $ | 1,224 |  |  | $ | 1,231 |  |  | $ | 1,263 |
Foreign Currency Exchange Rate Risk: |  |  |  |  |  |  |  |  |  |
Forward foreign currency exchange contracts |  | USD |  | September 2027 |  | $ | 202 |  |  | $ | 389 |  |  | $ | 240 |
Net investment hedge forward foreign exchange contracts |  | Euro |  | December 2026 |  | € | 181 |  |  | € | 181 |  |  | € | 256 |
Schedule of Derivative Assets, Liabilities and Effects of Offsetting | The following table presents the Company’s derivative assets and liabilities by type, as well as the effects of offsetting:
|  | March 31, 2025 |  | September 30, 2024 |  | March 31, 2024
Derivative assets: |  |  |  |  |  |
Derivatives designated as hedging instruments: |  |  |  |  |  |
Foreign currency contracts |  | $ | 12 |  |  | $ | 6 |  |  | $ | 11 |
Interest rate contracts |  | 1 |  |  | 1 |  |  | 11 |
|  | 13 |  |  | 7 |  |  | 22 |
Derivatives subject to PGC and DS mechanisms: |  |  |  |  |  |
Commodity contracts |  | 19 |  |  | 4 |  |  | 8 |
Derivatives not designated as hedging instruments: |  |  |  |  |  |
Commodity contracts |  | 222 |  |  | 129 |  |  | 138 |
Foreign currency contracts |  | 2 |  |  | — |  |  | 5 |
|  | 224 |  |  | 129 |  |  | 143 |
Total derivative assets — gross |  | 256 |  |  | 140 |  |  | 173 |
Gross amounts offset in the balance sheet |  | (138) |  |  | (88) |  |  | (111) |
Cash collateral received |  | (45) |  |  | (14) |  |  | (6) |
Total derivative assets — net |  | $ | 73 |  |  | $ | 38 |  |  | $ | 56 |
Derivative liabilities: |  |  |  |  |  |
Derivatives designated as hedging instruments: |  |  |  |  |  |
Interest rate contracts |  | $ | (11) |  |  | $ | (22) |  |  | $ | (3) |
Derivatives subject to PGC and DS mechanisms: |  |  |  |  |  |
Commodity contracts |  | — |  |  | (1) |  |  | (14) |
Derivatives not designated as hedging instruments: |  |  |  |  |  |
Commodity contracts |  | (159) |  |  | (151) |  |  | (208) |
Foreign currency contracts |  | (1) |  |  | (9) |  |  | (1) |
|  | (160) |  |  | (160) |  |  | (209) |
Total derivative liabilities — gross |  | (171) |  |  | (183) |  |  | (226) |
Gross amounts offset in the balance sheet |  | 138 |  |  | 88 |  |  | 111 |
Cash collateral pledged |  | — |  |  | 36 |  |  | 56 |
Total derivative liabilities — net |  | $ | (33) |  |  | $ | (59) |  |  | $ | (59) |
Schedule of Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI | The following tables provide information on the effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI:
Three Months Ended March 31,: |  |  |  |  |  |  |  |  |  |
|  | Gain (Loss) Recognized in AOCI |  | Gain (Loss) Reclassified from AOCI into Income |  | Location of Gain (Loss) Reclassified from AOCI into Income
Cash Flow Hedges: |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
Interest rate contracts |  | $ | (6) |  |  | $ | 17 |  |  | $ | (1) |  |  | $ | 14 |  |  | Interest expense
Net Investment Hedges: |  |  |  |  |  |  |  |  |  |
Foreign currency contracts |  | $ | (6) |  |  | $ | 8 |  |  |  |  |  |  |
|  | Gain (Loss) Recognized in Income |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments: |  | 2025 |  | 2024 |  | Location of Gain (Loss) Recognized in Income
Commodity contracts |  | $ | (1) |  |  | $ | (1) |  |  | Revenues
Commodity contracts |  | 67 |  |  | 26 |  |  | Cost of sales
Commodity contracts |  | — |  |  | (1) |  |  | Other operating expense (income), net
Foreign currency contracts |  | (9) |  |  | 8 |  |  | Other non-operating income (expense), net
Total |  | $ | 57 |  |  | $ | 32 |  |  |  |  |  |  |
Six Months Ended March 31,: |  |  |  |  |  |  |  |  |  |
|  | Gain (Loss) Recognized in AOCI |  | Gain (Loss) Reclassified from AOCI into Income |  | Location of Gain (Loss) Reclassified from AOCI into Income
Cash Flow Hedges: |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
Interest rate contracts |  | $ | 14 |  |  | $ | (5) |  |  | $ | 1 |  |  | $ | 27 |  |  | Interest expense
Net Investment Hedges: |  |  |  |  |  |  |  |  |  |
Foreign currency contracts |  | $ | 7 |  |  | $ | (2) |  |  |  |  |  |  |
|  | Gain (Loss) Recognized in Income |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments: |  | 2025 |  | 2024 |  | Location of Gain (Loss) Recognized in Income
Commodity contracts |  | $ | (2) |  |  | $ | 1 |  |  | Revenues
Commodity contracts |  | 136 |  |  | (129) |  |  | Cost of sales
Commodity contracts |  | (1) |  |  | 2 |  |  | Other operating expense (income), net
Foreign currency contracts |  | 16 |  |  | (8) |  |  | Other non-operating income (expense), net
Total |  | $ | 149 |  |  | $ | (134) |  |  |  |  |  |  |

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