Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Apr. 30, 2018 - Line of Credit [Member] $ in Millions, $ in Millions	USD ($)	CAD ($)
Berkshire Hathaway Energy [Member] | Unsecured credit facility, $1 billion, expiring May 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 1,000
Berkshire Hathaway Energy [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
Berkshire Hathaway Energy [Member] | Unsecured credit facility, $3.5 billion, expiring June 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,500
PacifiCorp [Member] | Unsecured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	400
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2021, increased and extended [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2021, extended [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring March 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900
Nevada Power Company [Member] | Secured credit facility, $400 million, expiring June 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400
Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2021 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250
AltaLink, L.P. [Member] | Secured credit facility, C$750 million, expiring December 2019 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		$ 750
AltaLink, L.P. [Member] | Secured credit facility, C$500 million, expiring December 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		500
AltaLink, L.P. [Member] | Secured credit facility, C$75 million, expiring December 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 75