Commitments and Contingencies - Commitments (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 114
PacifiCorp [Member] \| Klamath Hydroelectric System [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	200
PacifiCorp [Member] \| Klamath Hydroelectric System [Member] \| OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
PacifiCorp [Member] \| Klamath Hydroelectric System [Member] \| CALIFORNIA
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	250
Natural Gas Contracts For Resale [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation, Due Through Fifth Year	247
Purchase Obligation, Due after Fifth Year	70
Capital Addition Purchase Commitments [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	675
Purchase Obligation, Due in Next Twelve Months	84
Purchase Obligation, Due in Second Year	340
Purchase Obligation, Due in Third Year	$ 8

The additional amount for dam removal costs expected to be raised through a California bond measure.

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[Line Items] for Disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations.

+ References

No definition available.

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The maximum amount of dam removal costs.

+ References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing through the fifth fiscal year following the latest completed fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

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Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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