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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts (Details) € in Millions, kWh in Millions, gal in Millions, DTH in Millions, $ in Millions | Jun. 30, 2021 USD ($) kWh DTH gal | Jun. 30, 2021 EUR (€) kWh DTH gal | Sep. 30, 2020 USD ($) DTH kWh gal | Sep. 30, 2020 EUR (€) DTH kWh gal | Jun. 30, 2020 USD ($) DTH kWh gal | Jun. 30, 2020 EUR (€) DTH kWh gal
--- | --- | --- | --- | --- | --- | ---
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,424 | € 300 | $ 1,344 | € 300 | $ 1,347 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 504 | € 173 | $ 511 | € 173 | $ 440 | € 173
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 12 | 12 | 22 | 22 | 16 | 16
Non-utility Operations | Commodity contracts | LPG |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 688 | 688 | 846 | 846 | 890 | 890
Non-utility Operations | Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 4,730 | 4,730 | 4,705 | 4,705 | 4,144 | 4,144
Non-utility Operations | Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 344 | 344 | 339 | 339 | 343 | 343

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