Recent Financing Transactions	6 Months Ended
Recent Financing Transactions	Jun. 30, 2018
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In July 2018, BHE issued $1.0 billion of its 4.45% Senior Notes due 2049. BHE used the net proceeds to refinance a portion of the Company's short-term indebtedness and for general corporate purposes. In July 2018, Northern Natural Gas issued $450 million of its 4.30% Senior Bonds due 2049. Northern Natural Gas used the net proceeds to repay at maturity all of its $200 million 5.75% Senior Notes due July 2018 and for general corporate purposes. In July 2018, PacifiCorp issued $600 million of its 4.125% First Mortgage Bonds due 2049. PacifiCorp used a portion of the net proceeds to repay all of its $500 million 5.65% First Mortgage Bonds due July 2018 and intends to use the remaining net proceeds to fund capital expenditures and for general corporate purposes. In April 2018, Nevada Power issued $575 million of its 2.75% General and Refunding Mortgage Notes, Series BB, due April 2020. Nevada Power used a portion of the net proceeds to repay all of its $325 million 6.50% General and Refunding Mortgage Notes, Series O, maturing in May 2018. In August 2018, Nevada Power used the remaining net proceeds, together with available cash, to repay all of Nevada Power's $500 million 6.50% General and Refunding Mortgage Notes, Series S, maturing in August 2018. In February 2018, MidAmerican Energy issued $700 million of its 3.65% First Mortgage Bonds due 2048. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2017 to October 31, 2017, with respect to investments in MidAmerican Energy's 2,000-megawatt (nameplate capacity) Wind XI project and the repowering of certain of MidAmerican Energy's existing wind facilities, which were previously financed with MidAmerican Energy's general funds. In January 2018, BHE issued $450 million of its 2.375% Senior Notes due 2021, $400 million of its 2.80% Senior Notes due 2023, $600 million of its 3.25% Senior Notes due 2028 and $750 million of its 3.80% Senior Notes due 2048. The net proceeds were used to refinance a portion of the Company's short-term indebtedness and for general corporate purposes. Credit Facilities In April 2018, BHE terminated its $1.0 billion unsecured credit facility expiring May 2018 and amended and restated, with lender consent, its existing $2.0 billion unsecured credit facility expiring June 2020, increasing the lender commitment to $3.5 billion, extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp amended and restated its existing $400 million unsecured credit facility expiring June 2020, increasing the lender commitment to $600 million, extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp and MidAmerican Energy amended and restated their existing $600 million and $900 million unsecured credit facilities, respectively, each expiring June 2020, extending the expiration dates to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent. In April 2018, Nevada Power and Sierra Pacific amended and restated their existing $400 million and $250 million secured credit facilities, respectively, each expiring June 2020, extending the expiration dates to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent. In April 2018, ALP amended its existing C$750 million secured credit facility expiring December 2019, decreasing the lender commitment to C$500 million effective December 2018 and extending the expiration date to December 2022. ALP also amended its C$75 million secured credit facility expiring December 2019, extending the expiration date to December 2022.
Nevada Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In April 2018, Nevada Power issued $575 million of its 2.75% General and Refunding Mortgage Notes, Series BB, due April 2020. Nevada Power used a portion of the net proceeds to repay all of Nevada Power's $325 million 6.50% General and Refunding Mortgage Notes, Series O, maturing in May 2018. In August 2018, Nevada Power used the remaining net proceeds, together with available cash, to repay all of Nevada Power's $500 million 6.50% General and Refunding Mortgage Notes, Series S, maturing in August 2018. Credit Facilities In April 2018, Nevada Power amended and restated its existing $400 million secured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
PacifiCorp [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In July 2018, PacifiCorp issued $600 million of its 4.125% First Mortgage Bonds due 2049. PacifiCorp used a portion of the net proceeds to repay all of PacifiCorp's $500 million 5.65% First Mortgage Bonds due July 2018 and intends to use the remaining net proceeds to fund capital expenditures and for general corporate purposes. Credit Facilities In April 2018, PacifiCorp amended and restated, its existing $400 million unsecured credit facility expiring June 2020, increasing the lender commitment to $600 million, extending the expiration date to June 2021 and increasing from one to two, the available one-year extension options, subject to lender consent. In April 2018, PacifiCorp amended and restated, its existing $600 million unsecured credit facility expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In February 2018, MidAmerican Energy issued $700 million of its 3.65% First Mortgage Bonds due 2048. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2017 to October 31, 2017, with respect to investments in MidAmerican Energy's 2,000-megawatt (nameplate capacity) Wind XI project and the repowering of certain of MidAmerican Energy's existing wind facilities, which were previously financed with MidAmerican Energy's general funds. In March 2018, MidAmerican Energy repaid $350 million of its 5.30% Senior Notes due March 2018. Credit Facilities In April 2018, MidAmerican Energy amended and restated its existing $900 million unsecured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Refer to Note 5 of MidAmerican Energy's Notes to Financial Statements.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Credit Facilities In April 2018, Sierra Pacific amended and restated its existing $250 million secured credit facility, expiring June 2020, extending the expiration date to June 2021 and reducing from two to one, the available one-year extension options, subject to lender consent.