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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 | Dec. 31, 2020 USD ($) gal DTH kWh | Dec. 31, 2020 EUR (€) gal DTH kWh | Sep. 30, 2020 USD ($) gal kWh DTH | Sep. 30, 2020 EUR (€) gal kWh DTH | Dec. 31, 2019 USD ($) kWh gal DTH | Dec. 31, 2019 EUR (€) kWh gal DTH
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 719 | 719 | 846 | 846 | 772 | 772
Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 4,719 | 4,719 | 4,517 | 4,517 | 4,145 | 4,145
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 97 | 97 | 188 | 188 | 556 | 556
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | DTH | 342 | 342 | 339 | 339 | 358 | 358
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,306 | € 300 | $ 1,344 | € 300 | $ 1,354 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 457 | € 173 | $ 511 | € 173 | $ 431 | € 173
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | DTH | 16 | 16 | 22 | 22 | 15 | 15

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