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Commitments and Contingencies - Legal Matters (Details) (PacifiCorp [Member], USA Power [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Loss Contingencies [Line Items]  
Loss contingency, damages sought, legal fees as a percentage of damages 40.00%bhe_LossContingencyOriginalDamagesSoughtLegalFeesAsPercentageOfDamages
Loss contingency, damages awarded, value $ 113us-gaap_LossContingencyDamagesAwardedValue
Loss contingency, damages and attorney fees awarded, value 115bhe_LossContingencyDamagesandAttorneyFeesAwardedValue
Loss contingency accrual, at carrying value 120us-gaap_LossContingencyAccrualAtCarryingValue
Damages from Breach of Contract, Awarded By Jury [Member]
  
Loss Contingencies [Line Items]  
Loss contingency, damages awarded by jury, value 18bhe_LossContingencyDamagesAwardedByJuryValue
/ bhe_LitigationCaseNameAxis
= bhe_UsaPowerMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= bhe_DamagesFromBreachOfContractAwardedByJuryMember
/ us-gaap_StatementBusinessSegmentsAxis
= bhe_PacificorpMember
Damages from Unjust Enrichment, Awarded By Jury [Member]
  
Loss Contingencies [Line Items]  
Loss contingency, damages awarded by jury, value $ 113bhe_LossContingencyDamagesAwardedByJuryValue
/ bhe_LitigationCaseNameAxis
= bhe_UsaPowerMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= bhe_AmountAwardedForUnjustEnrichmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= bhe_PacificorpMember