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Accounting for Derivative Instruments - Volumetric Underlying Derivative Transactions (Details)	Dec. 31, 2016 MWh MMBTU	Dec. 31, 2015 MWh MMBTU
Non-trading | Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume buy (sell)	8,016	7,543
Non-trading | Natural Gas Basis
Derivatives, Fair Value [Line Items]
Net notional volume buy (sell)	0	455
Non-trading | Electricity
Derivatives, Fair Value [Line Items]
Net notional volume buy (sell) | MWh	3,958	1,187
Trading | Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume buy (sell)	(953)	8
Trading | Natural Gas Basis
Derivatives, Fair Value [Line Items]
Net notional volume buy (sell)	(380)	(455)

X

- Definition

Derivative, Nonmonetary Notional Amount, Energy Measure, Buy (Sell)

+ References

No definition available.

+ Details

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X

- 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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X

- Details

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X

- Details

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X

- Details

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- Details

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