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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Sep. 30, 2022
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, 2022 and 2021 and the final settlement dates of the Company's open derivative contracts as of September 30, 2022, (including amounts associated with our energy marketing businesses in the United Kingdom and France (Note 25)) but excluding those derivatives that qualified for the NPNS exception:
|  |  |  |  |  | Notional Amounts (in millions)
|  |  |  |  |  | September 30,
Type |  | Units |  | Settlements Extending Through |  | 2022 |  | 2021
Commodity Price Risk: |  |  |  |  |  |  |  |
Regulated Utility Operations |  |  |  |  |  |  |  |
PA Gas Utility NYMEX natural gas futures and option contracts |  | Dekatherms |  | October 2023 |  | 19 |  |  | 20 |
Non-utility Operations |  |  |  |  |  |  |  |
LPG swaps |  | Gallons |  | January 2025 |  | 874 |  |  | 708 |
Natural gas futures, forward, basis swap, options and pipeline contracts |  | Dekatherms |  | October 2026 |  | 363 |  |  | 355 |
Electricity forward and futures contracts |  | Kilowatt hours |  | December 2026 |  | 2,446 |  |  | 4,302 |
Interest Rate Risk: |  |  |  |  |  |  |  |
Interest rate swaps |  | Euro |  | October 2022 |  | € | 300 |  |  | € | 300 |
Interest rate swaps |  | USD |  | June 2026 |  | $ | 1,358 |  |  | $ | 1,421 |
Foreign Currency Exchange Rate Risk: |  |  |  |  |  |  |  |
Forward foreign exchange contracts |  | USD |  | August 2025 |  | $ | 465 |  |  | $ | 509 |
Net investment hedge forward foreign exchange contracts |  | Euro |  | December 2026 |  | € | 411 |  |  | € | 173 |
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:
| 2022 |  | 2021
Derivative assets: |  |  |
Derivatives designated as hedging instruments: |  |  |
Foreign currency contracts | $ | 57 |  |  | $ | 20 |
Interest rate contracts | 66 |  |  | — |
| 123 |  |  | 20 |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | 31 |  |  | 58 |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts (a) | 2,202 |  |  | 1,591 |
Foreign currency contracts | 62 |  |  | 18 |
| 2,264 |  |  | 1,609 |
Total derivative assets – gross | 2,418 |  |  | 1,687 |
Gross amounts offset in the balance sheet | (295) |  |  | (216) |
Cash collateral received | (398) |  |  | (468) |
Total derivative assets – net | $ | 1,725 |  |  | $ | 1,003 |
Derivative liabilities: |  |  |
Derivatives designated as hedging instruments: |  |  |
Interest rate contracts | $ | — |  |  | $ | (29) |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | (26) |  |  | (23) |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts (a) | (487) |  |  | (257) |
Foreign currency contracts | (2) |  |  | (8) |
| (489) |  |  | (265) |
Total derivative liabilities – gross | (515) |  |  | (317) |
Gross amounts offset in the balance sheet | 295 |  |  | 216 |
Cash collateral pledged | 7 |  |  | 3 |
Total derivative liabilities – net | $ | (213) |  |  | $ | (98) |
(a)Includes derivative assets and liabilities held-for-sale associated with the October 2022 sale of the United Kingdom energy marketing business (see Note 25).
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 2022, Fiscal 2021 and Fiscal 2020:
| Gain (Loss) Recognized in AOCI |  | Gain (Loss) Reclassified from AOCI into Income |  | Location of Gain (Loss) Reclassified from AOCI into Income
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts | 91 |  |  | 4 |  |  | (53) |  |  | (7) |  |  | (25) |  |  | (13) |  |  | Interest expense
Net Investment Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | 69 |  |  | $ | 4 |  |  | $ | (1) |  |  |  |  |  |  |  |  |
| Gain (Loss) Recognized in Income |  | Location of Gain (Loss) Recognized in Income |
| 2022 |  | 2021 |  | 2020 |
Derivatives Not Designated as Hedging Instruments: |  |  |  |  |  |  |  |
Commodity contracts | $ | (9) |  |  | $ | (17) |  |  | $ | 10 |  |  | Revenues |
Commodity contracts | 1,181 |  |  | 1,545 |  |  | (32) |  |  | Cost of sales |
Commodity contracts | 1 |  |  | 5 |  |  | — |  |  | Other operating income, net |
Foreign currency contracts | 63 |  |  | 9 |  |  | (20) |  |  | Other non-operating income (expense), net |
Total | $ | 1,236 |  |  | $ | 1,542 |  |  | $ | (42) |  |  |  |

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