Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Line of Credit [Member] $ in Millions	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)
HomeServices [Member] | Unsecured credit facility, $350 million, expiring July 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 350
HomeServices [Member] | Unsecured credit facility, $600 million, expiring September 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
MidAmerican Energy Company [Member] | Unsecured credit facility, $600 million, expiring March 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring March 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900	900
BHE [Member] | Unsecured credit facility, $2 billion, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 2,000
BHE [Member] | Unsecured credit facility, $1 billion, expiring May 2018 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
PacifiCorp [Member] | Unsecured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring March 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
Line of Credit Facility, Maximum Borrowing Capacity	600
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600	600
Nevada Power Company [Member] | Secured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
Maximum [Member] | Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] | MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] | BHE [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.70
Maximum [Member] | PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] | Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65