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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge	Dec. 31, 2020 MWh $ / MWh $ / MWh
PJM Western HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	642,280
Receive average prices (per MW-hr) | $ / MWh	34.02
NI HUB, Expiry December 2031
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,479,234
Receive average prices (per MW-hr) | $ / MWh	23.50
NI HUB, Expiry December 2027
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,953,751
Receive average prices (per MW-hr) | $ / MWh	24.76
ERCOT North HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,330,995
Receive average prices (per MW-hr) | $ / MWh	36.46

X

- Definition

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

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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