Related Party Transactions - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
NV Energy, Inc. [Member]
Related Party Transaction [Line Items]
Due from Affiliates	$ 0	$ 0
Due to Affiliate	21	20
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	6	9	$ 19
Nevada Power Company [Member]
Related Party Transaction [Line Items]
Due from Affiliates	0	0
Due to Affiliate	6	5
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	22	20	0
Related Party Transaction, Expense Reimbursement	16	16	0
Electric Distribution [Member] \| Nevada Power Company [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	2	8	1
Purchases from Related Party	69	33	$ 36
Due from Affiliates	1	4
Due to Affiliate	$ 15	$ 7

Expense reimbursement for charges incurred on behalf of affiliates.

No definition available.

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- Definition

For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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-Publisher FASB
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-Publisher FASB
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- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

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- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

No definition available.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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