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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Sep. 30, 2020
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, 2020 and 2019 and the final settlement dates of the Company's open derivative contracts as of September 30, 2020, excluding those derivatives that qualified for the NPNS exception:
|  |  |  |  |  | Notional Amounts (in millions)
|  |  |  |  |  | September 30,
Type |  | Units |  | Settlements Extending Through |  | 2020 |  | 2019
Commodity Price Risk: |  |  |  |  |  |  |  |
Regulated Utility Operations |  |  |  |  |  |  |  |
Gas Utility NYMEX natural gas futures and option contracts |  | Dekatherms |  | October 2021 |  | 22 |  |  | 23 |
Non-utility Operations |  |  |  |  |  |  |  |
LPG swaps |  | Gallons |  | February 2023 |  | 846 |  |  | 800 |
Natural gas futures, forward, basis swap, options and pipeline contracts |  | Dekatherms |  | December 2024 |  | 339 |  |  | 329 |
Electricity long forward and futures contracts |  | Kilowatt hours |  | January 2024 |  | 4,517 |  |  | 3,098 |
Electricity short forward and futures contracts |  | Kilowatt hours |  | April 2024 |  | 188 |  |  | 367 |
Interest Rate Risk: |  |  |  |  |  |  |  |
Interest rate swaps |  | Euro |  | October 2022 |  | € | 300 |  |  | € | 300 |
Interest rate swaps |  | USD |  | July 2024 |  | $ | 1,344 |  |  | $ | 1,357 |
Foreign Currency Exchange Rate Risk: |  |  |  |  |  |  |  |
Forward foreign exchange contracts |  | USD |  | September 2023 |  | $ | 511 |  |  | $ | 516 |
Net investment hedge forward foreign exchange contracts |  | Euro |  | October 2024 |  | € | 173 |  |  | € | 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:
| 2020 |  | 2019
Derivative assets: |  |  |
Derivatives designated as hedging instruments: |  |  |
Foreign currency contracts | $ | 17 |  |  | $ | 17 |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | 7 |  |  | 1 |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts | 100 |  |  | 41 |
Foreign currency contracts | 15 |  |  | 42 |
| 115 |  |  | 83 |
Total derivative assets – gross | 139 |  |  | 101 |
Gross amounts offset in the balance sheet | (57) |  |  | (29) |
Total derivative assets – net | $ | 82 |  |  | $ | 72 |
Derivative liabilities: |  |  |
Derivatives designated as hedging instruments: |  |  |
Interest rate contracts | $ | (55) |  |  | $ | (12) |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | — |  |  | (4) |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts | (118) |  |  | (171) |
Foreign currency contracts | (14) |  |  | (4) |
| (132) |  |  | (175) |
Total derivative liabilities – gross | (187) |  |  | (191) |
Gross amounts offset in the balance sheet | 57 |  |  | 29 |
Cash collateral pledged | 7 |  |  | 29 |
Total derivative liabilities – net | $ | (123) |  |  | $ | (133) |
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 2020, Fiscal 2019 and Fiscal 2018:
| Gain (Loss) Recognized in AOCI |  | Gain (Loss) Reclassified from AOCI into Income |  | Location of Gain (Loss) Reclassified from AOCI into Income
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | (3) |  |  | Cost of sales
Cross-currency contracts | — |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | 1 |  |  | Interest expense /other operating income, net
Interest rate contracts | (53) |  |  | (11) |  |  | — |  |  | (13) |  |  | (6) |  |  | (5) |  |  | Interest expense
Total | $ | (53) |  |  | $ | (10) |  |  | $ | 2 |  |  | $ | (13) |  |  | $ | (4) |  |  | $ | (7) |  |  |
Net Investment Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | (1) |  |  | $ | 17 |  |  | $ | — |  |  |  |  |  |  |  |  |
| Gain (Loss) Recognized in Income |  | Location of Gain (Loss) Recognized in Income |
| 2020 |  | 2019 |  | 2018 |
Derivatives Not Designated as Hedging Instruments: |  |  |  |  |  |  |  |
Commodity contracts | $ | (32) |  |  | $ | (344) |  |  | $ | 155 |  |  | Cost of sales |
Commodity contracts | 10 |  |  | 7 |  |  | (5) |  |  | Revenues |
Foreign currency contracts | (20) |  |  | 38 |  |  | 16 |  |  | Other non-operating (expense) income, net |
Total | $ | (42) |  |  | $ | (299) |  |  | $ | 166 |  |  |  |

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