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Financial instruments - Long-term Energy Derivative Contracts (Detail)	Jun. 30, 2023 dth MWh $ / MWh
Derivative [Line Items]
Nonmonetary notional amount | dth	2,755,733
Cash flow hedge | Illinois Hub, Expiry September 2030
Derivative [Line Items]
Nonmonetary notional amount | MWh	3,772,462
Receive average prices (per MW-hr) | $ / MWh	25.00
Cash flow hedge | PJM Western HUB, Expiry December 2028
Derivative [Line Items]
Nonmonetary notional amount | MWh	404,612
Receive average prices (per MW-hr) | $ / MWh	29.00
Cash flow hedge | NI HUB, Expiry December 2027
Derivative [Line Items]
Nonmonetary notional amount | MWh	1,707,551
Receive average prices (per MW-hr) | $ / MWh	22.00
Cash flow hedge | ERCOT North HUB, Expiry December 2027
Derivative [Line Items]
Nonmonetary notional amount | MWh	1,471,065
Receive average prices (per MW-hr) | $ / MWh	36.00

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The average strike price on the group of price risk option contracts such as put options or call options.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Section 50
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Nominal number of units used to calculate payment on derivative.

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