Common Shareholder's Equity - PAC (Details) - PAC $ in Billions	12 Months Ended
Dec. 31, 2021 USD ($)
Class of Stock [Line Items]
Minimum common equity to capitalization percentage	44.00%
Actual common equity percentage as calculated in accordance with acquisition commitment	54.00%
Amount available for dividend distribution without prior approval	$ 3.2

Represents the minimum common equity to total capitalization percentage, excluding short-term debt and current maturities of long-term debt, allowed under acquisition commitments without prior regulatory approval of dividends.

No definition available.

Name:	bhe_MinimumCommonEquityToCapitalizationPercentage
Namespace Prefix:	bhe_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration