Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Legal Matters (Details) - PacifiCorp [Member] - USA Power [Member] $ in Millions	6 Months Ended
Jun. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Loss contingency, damages and attorney fees awarded, value	$ 115
Loss contingency, damages awarded, value	113
Loss Contingency, Damages Paid, Value	123
Amount Awarded for Actual Damages [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	18
Damages from Unjust Enrichment, Awarded By Jury [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	$ 113

Amount of damages the jury awarded to the plaintiff for breach of contract and misappropriation of a trade secret.

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Amount of damages and attorney's fees awarded to the plaintiff in the legal matter.

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Amount of damages awarded to the plaintiff in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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Amount of damages paid to the plaintiff in the legal matter.

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