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Related Party Transactions - SPPC (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Related Party Transaction, Cash Received for Income Taxes, Net $ 900,000,000 $ 600,000,000 $ 1,053,000,000
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 4,000,000 5,000,000 5,000,000
Due from Affiliates 0 0  
Due to Affiliate 15,000,000 17,000,000  
Income Taxes Receivable From (Payable To) Related Parties Current 3,000,000 0 0
Related Party Transaction, Cash Received for Income Taxes, Net 19,000,000 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 28,000,000 27,000,000 24,000,000
Due from Affiliates 0 0  
Due to Affiliate 5,000,000 5,000,000  
Related Party Transaction, Expense Reimbursement 15,000,000 17,000,000 14,000,000
Sierra Pacific Power Company [Member] | Electric Distribution [Member] | Nevada Power Company [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 28,000,000 21,000,000 17,000,000
Due from Affiliates 1,000,000 0  
Purchases from Related Party 91,000,000 104,000,000 $ 78,000,000
Due to Affiliate $ 6,000,000 $ 10,000,000