Commitments and Contingencies - Commitments (Details) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 422
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
Long-term Renewable Power Purchase Agreement [Member] \| PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	1,000
Capital Addition Purchase Commitments [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	563
Capital Addition Purchase Commitments [Member] \| PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	566
Public Utilities, Inventory, Fuel [Member] \| PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	273
Maintenance, service and other contracts [Member] \| MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	$ 226

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

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- Definition

[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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- Definition

The maximum amount of dam removal costs.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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