Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) £ in Millions, $ in Millions	Oct. 31, 2019 GBP (£)	Aug. 31, 2019 USD ($)	May 31, 2019 USD ($)
MidAmerican Energy Company [Member] | Unsecured credit facility, $400 million, expiring August 2020 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring June 2022 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 900
Berkshire Hathaway Energy [Member] | Unsecured credit facility, $3.5 billion, expiring June 2022 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			3,500
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2022, first facility, extended [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			600
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2022, second facility, extended [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			600
NVE Holdings [Member] | Line of Credit [Member] | Nevada Power Company [Member] | Secured credit facility, $400 million, expiring June 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			400
NVE Holdings [Member] | Line of Credit [Member] | Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 250
Subsequent Event [Member] | Northern Powergrid Holdings [Member] | Multicurrency revolving credit facility, expiring October 2022 [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £	£ 150