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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) $ in Millions	Jun. 30, 2018 USD ($) merchants megawatts
Derivative
Number of active future commission merchants | merchants	2
Total derivatives not subject to master netting or similar arrangement | $	$ 27	[1]
Megawatts of Power Purchase Agreement
Derivative
Megawatts | megawatts	440
[1] There are no derivative contracts subject to a master netting arrangement or similar agreement that are not offset in the consolidated balance sheets.

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- Definition

Megawatts of summer net capability

+ References

No definition available.

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- Definition

Number of active future commission merchants to clear commodity contracts.

+ References

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- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226052-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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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.

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- Details

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