Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - BHE Pipeline Group [Member] $ in Millions	Mar. 31, 2021 USD ($)
Northern Natural Gas | Senior Notes, 3.40%, due 2051
Debt Instrument [Line Items]
Face amount	$ 550
Northern Natural Gas | Senior Notes, 4.25%, due 2021
Debt Instrument [Line Items]
Face amount	$ 200
Subsidiary Debt [Member] | Senior Notes, 3.40%, due 2051
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.40%
Subsidiary Debt [Member] | Senior Notes, 4.25%, due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%