Regulatory Matters (Notes)	9 Months Ended
Sep. 30, 2014
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Matters	Regulatory Matters Energy Efficiency Implementation Rates The Public Utilities Commission of Nevada's ("PUCN") final order approving the merger between BHE and NV Energy stipulated that the Company will not seek recovery of any lost revenue for calendar year 2014 in an amount that exceeds 50% of the lost revenue that the Company could otherwise request. In February 2014, the Company filed an application with the PUCN to reset the energy efficiency implementation rate. In June 2014, the PUCN accepted a stipulation to adjust the energy efficiency implementation rate, as of July 1, 2014, to collect 50% of the estimated lost revenue that the Company would otherwise be allowed to recover for the 2014 calendar year. The energy efficiency implementation rate will be effective from July through December 2014 and will reset on January 1, 2015 and remain in effect through September 2015. To the extent the Company's earned rate of return exceeds the rate of return used to set base general rates, the Company is required to refund to customers energy efficiency implementation rate revenue collected. As a result, the Company has deferred recognition of energy efficiency implementation rate revenue collected and has recorded a liability of $3 million on the Consolidated Balance Sheets as of September 30, 2014. General Rate Case In connection with Nevada Power's general rate case filing in May 2014, as required by the PUCN, the Company made a "companion filing" for the purpose of documenting the costs and benefits of the Company's investment in the advanced service delivery program. In October 2014, the PUCN issued an order in the companion filing issued with the general rate case order that, among other things, provided for the implementation of new rates effective January 1, 2015 to begin recovery of costs associated with advance service delivery. The recovery costs will increase annual revenue approximately $10 million. As a result of the PUCN order in the companion filing issued with the Nevada Power general rate case order, the Company recorded $7 million in asset impairments related to property, plant and equipment and $1 million of regulatory asset impairments, which are included in operating and maintenance expense on the Consolidated Statements of Operations for the three- and nine-month periods ended September 30, 2014. 2013 Federal Energy Regulatory Commission Transmission Rate Case In May 2013, the Company, along with Nevada Power, filed an application with the Federal Energy Regulatory Commission ("FERC") to establish single system transmission and ancillary service rates. The combined filing requested incremental rate relief of $17 million annually to be effective January 1, 2014. In August 2013, the FERC granted the companies' request for a rate effective date of January 1, 2014 subject to refund, and set the case for hearing or settlement discussions. On January 1, 2014, the Company implemented the filed rates in this case subject to refund as set forth in the FERC's order. In September 2014, the Company, along with Nevada Power, filed an unopposed settlement offer with the FERC on behalf of NV Energy and the intervening parties providing rate relief of $4 million. The settlement offer would resolve all outstanding issues related to this case. In addition, a preliminary order from the administrative law judge granting the motion for interim rate relief was issued, which authorizes the Company to institute the interim rates effective September 1, 2014, and begin billing transmission customers under the settlement rates for service provided on and after that date. These will remain in effect pending the FERC's approval. As of September 30, 2014, the Company accrued $2 million for amounts subject to rate refund, which is included in customer deposits and other on the Consolidated Balance Sheets. In October 2014, the FERC judge certified the settlement and referred to the FERC for final approval. Once the FERC approves the Offer of Settlement, the Company will refund amounts that were billed to the FERC transmission customers subject to refund.

Regulatory Matters

Energy Efficiency Implementation Rates

The Public Utilities Commission of Nevada's ("PUCN") final order approving the merger between BHE and NV Energy stipulated that the Company will not seek recovery of any lost revenue for calendar year 2014 in an amount that exceeds 50% of the lost revenue that the Company could otherwise request. In February 2014, the Company filed an application with the PUCN to reset the energy efficiency implementation rate. In June 2014, the PUCN accepted a stipulation to adjust the energy efficiency implementation rate, as of July 1, 2014, to collect 50% of the estimated lost revenue that the Company would otherwise be allowed to recover for the 2014 calendar year. The energy efficiency implementation rate will be effective from July through December 2014 and will reset on January 1, 2015 and remain in effect through September 2015. To the extent the Company's earned rate of return exceeds the rate of return used to set base general rates, the Company is required to refund to customers energy efficiency implementation rate revenue collected. As a result, the Company has deferred recognition of energy efficiency implementation rate revenue collected and has recorded a liability of $3 million on the Consolidated Balance Sheets as of September 30, 2014.

General Rate Case

In connection with Nevada Power's general rate case filing in May 2014, as required by the PUCN, the Company made a "companion filing" for the purpose of documenting the costs and benefits of the Company's investment in the advanced service delivery program. In October 2014, the PUCN issued an order in the companion filing issued with the general rate case order that, among other things, provided for the implementation of new rates effective January 1, 2015 to begin recovery of costs associated with advance service delivery. The recovery costs will increase annual revenue approximately $10 million. As a result of the PUCN order in the companion filing issued with the Nevada Power general rate case order, the Company recorded $7 million in asset impairments related to property, plant and equipment and $1 million of regulatory asset impairments, which are included in operating and maintenance expense on the Consolidated Statements of Operations for the three- and nine-month periods ended September 30, 2014.

2013 Federal Energy Regulatory Commission Transmission Rate Case

In May 2013, the Company, along with Nevada Power, filed an application with the Federal Energy Regulatory Commission ("FERC") to establish single system transmission and ancillary service rates. The combined filing requested incremental rate relief of $17 million annually to be effective January 1, 2014. In August 2013, the FERC granted the companies' request for a rate effective date of January 1, 2014 subject to refund, and set the case for hearing or settlement discussions. On January 1, 2014, the Company implemented the filed rates in this case subject to refund as set forth in the FERC's order.

In September 2014, the Company, along with Nevada Power, filed an unopposed settlement offer with the FERC on behalf of NV Energy and the intervening parties providing rate relief of $4 million. The settlement offer would resolve all outstanding issues related to this case. In addition, a preliminary order from the administrative law judge granting the motion for interim rate relief was issued, which authorizes the Company to institute the interim rates effective September 1, 2014, and begin billing transmission customers under the settlement rates for service provided on and after that date. These will remain in effect pending the FERC's approval. As of September 30, 2014, the Company accrued $2 million for amounts subject to rate refund, which is included in customer deposits and other on the Consolidated Balance Sheets. In October 2014, the FERC judge certified the settlement and referred to the FERC for final approval. Once the FERC approves the Offer of Settlement, the Company will refund amounts that were billed to the FERC transmission customers subject to refund.