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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge	Dec. 31, 2017 MWh $ / MWh
PJM Western HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	688,147
Receive average prices (per MW-hr) | $ / MWh	40.40
NI HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,926,922
Receive average prices (per MW-hr) | $ / MWh	29.26
ERCOT North HUB
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	3,330,876
Receive average prices (per MW-hr) | $ / MWh	36.46

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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- Details

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