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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge	Jun. 30, 2019 MWh $ / MWh
PJM Western HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	806,770
Receive average prices (per MW-hr) | $ / MWh	35.81
NI HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,664,040
Receive average prices (per MW-hr) | $ / MWh	27.51
ERCORT North HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,803,607
Receive average prices (per MW-hr) | $ / MWh	36.46
MISO Illinois HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	5,254,390
Receive average prices (per MW-hr) | $ / MWh	24.54

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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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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- Details

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- Details

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- Details

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