Employee Benefit Plans - EEGH - Pension Remeasurement (Details) - EEGH - Pension Benefit Plan Associated With GT&S Transaction $ in Millions	3 Months Ended
Sep. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Increase in the pension benefit obligation	$ 3
Decrease in fair value of the pension plan assets	$ 7
Discount rate	3.16%

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) For Remeasurement Due To Curtailment

No definition available.

Name:	bhe_DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToCurtailment
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Defined Benefit Plan, Plan Assets, Increase (Decrease) For Remeasurement Due To Curtailment

+ References

No definition available.

+ Details

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

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=bhe_EasternEnergyGasHoldingsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanNameAxis=bhe_PensionBenefitPlanAssociatedWithGTSTransactionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: