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Related Party Transactions - SPPC (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current $ 334,000,000 $ (27,000,000)  
Related Party Transaction, Cash Received for Income Taxes, Net 600,000,000 1,100,000,000 $ 1,781,000,000
Sierra Pacific Power Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 1,000,000 1,000,000 1,000,000
Sierra Pacific Power Company [Member] | NV Energy, Inc. [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 5,000,000 5,000,000 6,000,000
Due from Affiliates 0 0  
Due to Affiliate 17,000,000 18,000,000  
Income Taxes Receivable From (Payable To) Related Parties Current 0 0 0
Related Party Transaction, Cash Received for Income Taxes, Net 0 0 0
Sierra Pacific Power Company [Member] | Nevada Power Company [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 27,000,000 24,000,000 22,000,000
Related Party Transaction, Expense Reimbursement 17,000,000 14,000,000 16,000,000
Due from Affiliates 0 0  
Due to Affiliate 5,000,000 4,000,000  
Sierra Pacific Power Company [Member] | Electric Distribution [Member] | Nevada Power Company [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 21,000,000 17,000,000 2,000,000
Purchases from Related Party 104,000,000 78,000,000 $ 69,000,000
Due from Affiliates 0 12,000,000  
Due to Affiliate $ 10,000,000 $ 45,000,000