Related Party Transactions - NPC (Details) - Nevada Power Company [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Kern River [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	$ 68	$ 68	$ 68
Due to Affiliate, Current	5	5
Sierra Pacific Power Company [Member]
Related Party Transaction [Line Items]
Due to Affiliate	0	0
Due from Affiliates	6	5
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	16	16	22
Related Party Transaction, Expense Reimbursement	22	20	24
NV Energy, Inc. [Member]
Related Party Transaction [Line Items]
Due to Affiliate	40	33
Due from Affiliates	0	0
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	12	19	45
Related Party Transaction, Expense Reimbursement	1	1	0
Electric Distribution [Member] \| PacifiCorp [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	2	5	2
Revenue from Related Parties	3	3	3
Due to Affiliate	0	4
Due from Affiliates	0	0
Electric Distribution [Member] \| Sierra Pacific Power Company [Member]
Related Party Transaction [Line Items]
Purchases from Related Party	2	8	1
Revenue from Related Parties	69	33	$ 36
Due to Affiliate	1	0
Due from Affiliates	$ 15	$ 7

Expense reimbursement for charges incurred on behalf of affiliates.

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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.

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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.

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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

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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.

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