Name:	bhe_ChangesInFairValueDerivativesRecognizedInRegulatoryAssetsOrLiabilitiesNet
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net change in regulatory assets and liabilities related to derivatives not designated as hedging instruments and used for domestic regulated operations as a result of losses and gains on those derivatives that were reclassified to cost of sales during the period.

No definition available.

Name:	bhe_NetGainsLossesReclassifiedToCostOfSales
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	bhe_NetGainsLossesReclassifiedToOperatingRevenue
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net amount of regulatory assets and liabilities as of the balance sheet date representing the net effective portion of unrealized losses and gains on derivatives not designated as hedging instruments and used for domestic regulated operations. Unrealized losses and gains on derivatives used for domestic regulated operations are generally recorded as regulatory assets or liabilities due to the realized losses and gains on such derivatives being included in regulated rates.

No definition available.

Name:	bhe_NetRegulatoryAssetLiabilityUnrealizedLossGainOnDerivativeContracts
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Regulatory assets (liabilities), net, acquired (assumed) as a result of acquisitions.

No definition available.

Name:	bhe_RegulatoryAssetsLiabilitiesNetAcquisitions
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.